High anti-cavitation centrifugal pump

Abstract

The utility model discloses a centrifugal pump with high cavitation resistance, and relates to the technical field of centrifugal pumps, the centrifugal pump comprises a bottom frame, a driving device, a pump body shell, a pump cover body and an end pipe, and the middle part of the pump body shell is rotatably connected with an inducer mechanism. A plurality of groups of thin and long induction wheel blades divide water flow into a plurality of parts, the end pipe is filled with liquid uniformly, the situation that when the pressure in the end pipe is insufficient, the water flow on the upper portion of an inner cavity of the end pipe is insufficient, bubbles are generated to cavitation the impeller is relieved, meanwhile, the liquid uniformly enters the inner cavity formed by the pump body shell and the pump cover body, the flow speed of all the parts is uniform, and the flow speed is increased. Therefore, when the inlet pressure of the centrifugal pump is guaranteed and the impeller bears small cavitation, the excavation depth of civil engineering is reduced, and the civil engineering difficulty is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal pumps, in particular to a high cavitation resistance centrifugal pump. Background Art

[0002] Centrifugal pumps are mainly used for water supply and drainage in industries such as industry, municipal engineering, water conservancy, tap water, hospitals, construction, hotels, restaurants, sewage treatment plants, etc. Centrifugal pumps account for a large proportion of water pumps. At present, people focus on the efficiency of water pumps. However, improving the cavitation performance of centrifugal pumps is also of great significance and can even solve many problems.

[0003] For example, Chinese patent CN206092433U discloses a self-priming centrifugal pump with high cavitation resistance, which includes a pump body, a pump cover, a bearing frame and an impeller installed on a pump shaft. The pump body has three cavities, namely a water suction chamber, a liquid storage chamber and a water pressure chamber. The liquid storage chamber is connected to the water suction chamber and the water pressure chamber. A straightening ring is installed at the outlet of the water suction chamber. The straightening ring includes a serrated annular baffle on the front side that can suppress axial inlet backflow and cross-sectional secondary flow, and a ring sleeve on the rear side; the straightening ring is provided at the outlet of the water suction chamber. A number of grooves are arranged at intervals on the inner circumference of the front side of the flow ring, and the grooves form a circle of sawtooth annular baffle. The sawtooth spacing on the upper side of the sawtooth annular baffle is small, and the sawtooth with small spacing forms a sawtooth densification area; the sawtooth on the left and right sides of the sawtooth annular baffle is lengthened; the inner circle of the ring sleeve matches the impeller mouth ring, and the axial size is consistent with the impeller mouth ring; the outer circle of the ring sleeve is fixedly matched with the pump body, the front side is flush with the outlet end face of the water suction chamber, and the rear side is flush with the boss on the pump body.

[0004] However, in the existing technology, most of the centrifugal pumps in concrete pumping stations currently use the method of backflow water diversion. The essential reason for the cavitation of centrifugal pumps is that as the installation height of the centrifugal pump increases, the inlet pressure is less than the saturated vapor pressure at the fluid delivery temperature. In order to reduce the degree of cavitation of the centrifugal pump, it is necessary to increase the excavation depth of the civil engineering, which increases the difficulty of the civil engineering and lays the risk of leakage in the pump station. Summary of the invention

[0005] The utility model aims to solve the problems in the prior art that the centrifugal pump has poor anti-cavitation ability and requires a large submersion depth and a deep installation depth, and proposes a high anti-cavitation centrifugal pump.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a highly cavitation-resistant centrifugal pump, comprising a base frame, a driving device, a pump body shell, a pump cover body and an end pipe, the middle part of the pump body shell is rotatably connected with an inducer mechanism, the inducer mechanism is located in the middle of the pump body shell and the pump cover body, the inner side of the pump cover body is provided with a large-angle fillet, the inducer mechanism is composed of a bolt rod, a sleeve, inducer blades, a radian sheet, a wheel disc and a center axis, a plurality of groups of the radian sheets are circumferentially welded on one side of the wheel disc, the middle part of one side of the wheel disc is fixedly connected with an inducer blade by the bolt rod, the bolt rod and the inducer blade are fixedly installed by a key, and the inducer blade extends to the interior of the end pipe.

[0007] Preferably, one end of the central axis is fixedly connected to the other side of the wheel disc, and the central axis passes through the middle of the pump cover body.

[0008] Preferably, a bearing is fixedly mounted on the other end of the central shaft, and a first fastening ring and a second fastening ring are fixedly clamped on the outer side of the bearing.

[0009] Preferably, the first fastening ring and the second fastening ring are fixedly connected by bolts, and one end of the pump cover body is threadedly connected with two groups of threaded rods.

[0010] Preferably, the first fastening ring and the second fastening ring abut against one side of the pump cover body through the threaded rod.

[0011] Preferably, the end pipe is fixedly connected to one side of the pump cover body by bolts, and the pump cover body is fixedly connected to one side of the base frame by bolts.

[0012] Preferably, the driving device is fixedly connected to the middle part of the upper side of the base frame, and the output shaft of the driving device is fixedly mounted to one end of the central shaft by a key.

[0013] Compared with the prior art, the advantages and positive effects of the utility model are:

[0014] 1. In the utility model, multiple groups of inducer blades are relatively long and have a relatively small twist angle, and penetrate the interior of the end pipe. When the liquid passes through the end pipe, the multiple groups of thin and long inducer blades divide the water flow into several parts, and fill the interior of the end pipe with the liquid more evenly, thereby alleviating the situation that when the pressure in the end pipe is insufficient, the water flow in the upper part of the inner cavity of the end pipe is insufficient, resulting in bubble cavitation of the impeller. At the same time, the liquid enters the inner cavity composed of the pump body shell and the pump cover body more evenly, and the flow velocity of each part is uniform, so as to prevent sudden pressure changes and further alleviate the impeller cavitation. Therefore, while ensuring the inlet pressure of the centrifugal pump and the impeller is subjected to less cavitation, the excavation depth of the civil engineering is reduced, and the difficulty of the civil engineering is reduced.

[0015] 2. In the utility model, the position of the bearing is limited by the first fastening ring and the second fastening ring fixed by bolts, and the two sets of threaded rods position the whole formed by the first fastening ring and the second fastening ring in the middle of the pump cover body, ensuring that the central axis is always located in the middle of the pump cover body in both static and rotating conditions, thereby ensuring that the inducer mechanism rotates stably in the pump cavity composed of the pump body shell and the pump cover body, avoiding abnormal rotation of the inducer mechanism and aggravating cavitation, and improving the long-term operation stability of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional structural schematic diagram of a high cavitation resistance centrifugal pump is proposed for the utility model;

[0017] Figure 2 A side view of the interior of a pump cover in a high cavitation resistance centrifugal pump proposed in the utility model;

[0018] Figure 3 The utility model provides a schematic diagram of the exploded three-dimensional structure of a high cavitation resistance centrifugal pump;

[0019] Figure 4 The utility model provides a three-dimensional structural schematic diagram of the inducer mechanism in a high cavitation resistance centrifugal pump;

[0020] Figure 5 The utility model provides a three-dimensional structural schematic diagram of the central axis connection relationship in a high cavitation resistance centrifugal pump.

[0021] Legend: 1. Base frame; 2. Driving device; 3. Pump body shell; 4. Pump cover body; 41. Threaded rod; 42. First fastening ring; 43. Bearing; 44. Second fastening ring; 5. End pipe; 6. Inducer mechanism; 61. Bolt rod; 62. Sleeve; 63. Inducer blade; 64. Curved piece; 65. Wheel; 66. Center shaft. DETAILED DESCRIPTION

[0022] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure. Embodiment 1

[0024] like Figure 1-5As shown, the utility model provides a high cavitation resistance centrifugal pump, including a base frame 1, a driving device 2, a pump body shell 3, a pump cover body 4 and an end pipe 5. The middle part of the pump body shell 3 is rotatably connected with an inducer mechanism 6, which is located in the middle of the pump body shell 3 and the pump cover body 4. The inner side of the pump cover body 4 is provided with a large-angle fillet. The inducer mechanism 6 is composed of a bolt rod 61, a sleeve 62, an inducer blade 63, an arc piece 64, a wheel disc 65 and a center shaft 66. A plurality of groups of arc pieces 64 are circumferentially welded on one side of the wheel disc 65. The middle part of one side of the wheel disc 65 is fixedly connected with the inducer blade 63 by the bolt rod 61. The bolt rod 61 and the inducer blade 63 are fixedly installed by a key. The inducer blade 63 extends to the inside of the end pipe 5. One end of the center shaft 66 is fixedly connected to the other side of the wheel disc 65, and the center shaft 66 runs through the middle part of the pump cover body 4.

[0025] The specific configuration and function of this embodiment are described in detail below: by controlling the driving device 2 to start, the output shaft of the driving device 2 drives the central shaft 66 to rotate in the middle of the pump cover 4 under the action of the key, and the central shaft 66 drives the impeller composed of multiple groups of arc pieces 64 and the wheel disc 65 to rotate. The centrifugal force generated by the rotation draws the external liquid into the pump cavity composed of the pump shell 3 and the pump cover 4 through the end pipe 5, and discharges it from the pump shell 3. At the same time, the wheel disc 65 also drives the inducer composed of the bolt rod 61, the sleeve 62 and the inducer blade 63 to rotate. The arc piece 64 and the inducer blade 63 are twisted in the same direction, and the multiple groups of inducer blades 65 are rotated. 3 is relatively long and has a small twist angle, and runs through the inside of the end pipe 5. When the liquid passes through the end pipe 5, multiple groups of thin and long inducer blades 63 divide the water flow into several parts, and fill the inside of the end pipe 5 with liquid more evenly, thereby reducing the situation that when the pressure in the end pipe 5 is insufficient, the water flow in the upper part of the inner cavity of the end pipe 5 is insufficient, resulting in bubble cavitation of the impeller. At the same time, the liquid enters the inner cavity composed of the pump body shell 3 and the pump cover body 4 more evenly, and the flow velocity of each part is uniform, which prevents sudden pressure changes and further reduces the cavitation of the impeller. Therefore, when the inlet pressure of the centrifugal pump is guaranteed and the impeller is subjected to less cavitation, the excavation depth of the civil engineering is reduced, and the difficulty of the civil engineering is reduced. Embodiment 2

[0026] like Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, the center shaft 66 passes through the middle of the pump cover body 4, and the other end of the center shaft 66 is fixedly installed with a bearing 43, and the outer side of the bearing 43 is fixedly clamped with a first fastening ring 42 and a second fastening ring 44, the first fastening ring 42 and the second fastening ring 44 are fixedly connected by bolts, one end of the pump cover body 4 is threadedly connected with two groups of threaded rods 41, the first fastening ring 42 and the second fastening ring 44 are abutted against one side of the pump cover body 4 through the threaded rods 41, the end pipe 5 is fixedly connected to one side of the pump cover body 4 by bolts, the pump cover body 4 is fixedly connected to one side of the base frame 1 by bolts, the drive device 2 is fixedly connected to the middle part of the upper side of the base frame 1, and the output shaft of the drive device 2 is fixedly installed with one end of the center shaft 66 by a key.

[0027] The effect achieved by the entire embodiment is that the position of the bearing 43 is limited by the first fastening ring 42 and the second fastening ring 44 fixed by bolts, and the two sets of threaded rods 41 position the whole formed by the first fastening ring 42 and the second fastening ring 44 in the middle of the pump cover body 4, ensuring that the central axis 66 is always located in the middle of the pump cover body 4 in both static and rotating conditions, thereby ensuring that the inducer mechanism 6 stably rotates in the pump cavity composed of the pump body shell 3 and the pump cover body 4, avoiding abnormal rotation of the inducer mechanism 6 and aggravating cavitation, and improving the long-term operation stability of the pump.

[0028] The use method and working principle of the device: When using the high cavitation resistance centrifugal pump, connect the output pipe to the pump body shell 3, connect the input pipe to the end pipe 5, control the drive device 2 to start, drive the central shaft 66 to rotate in the middle of the pump cover 4, and the central shaft 66 drives the impeller composed of multiple groups of arc pieces 64 and the wheel 65 to rotate. The centrifugal force generated by the rotation draws the external liquid into the pump cavity composed of the pump body shell 3 and the pump cover 4 through the end pipe 5, and discharges it from the pump body shell 3. At the same time, the wheel 65 also drives the inducer composed of the bolt rod 61, the sleeve 62 and the inducer blade 63 to rotate. The arc The torsion direction of blade 64 and inducer vane 63 is the same. Multiple groups of inducer vanes 63 are relatively long and have a relatively small torsion angle. They penetrate the interior of end pipe 5. When liquid passes through end pipe 5, multiple groups of thin and long inducer vanes 63 divide the water flow into several parts, and fill the interior of end pipe 5 with liquid more evenly, thereby alleviating the situation where the pressure in end pipe 5 is insufficient and the water flow in the upper part of the inner cavity of end pipe 5 is insufficient, resulting in bubble cavitation of the impeller. At the same time, the liquid enters the inner cavity formed by pump body shell 3 and pump cover body 4 more evenly, making the flow velocity of each part uniform, preventing sudden pressure change, and further alleviating the impeller cavitation.

[0029] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A high cavitation resistance centrifugal pump, comprising a base frame (1), a driving device (2), a pump casing (3), a pump cover (4) and an end pipe (5), characterized in that: The middle part of the pump body shell (3) is rotatably connected to an inducer mechanism (6), the inducer mechanism (6) is located in the middle part of the pump body shell (3) and the pump cover body (4), the inner side of the pump cover body (4) is provided with a large angle fillet, the inducer mechanism (6) is composed of a bolt rod (61), a sleeve (62), an inducer blade (63), an arc piece (64), a wheel disc (65) and a central shaft (66), a plurality of groups of the arc pieces (64) are welded in a circumferential manner on one side of the wheel disc (65), the middle part of one side of the wheel disc (65) is fixedly connected to an inducer blade (63) through the bolt rod (61), the bolt rod (61) and the inducer blade (63) are fixedly installed by a key, and the inducer blade (63) extends to the inside of the end pipe (5).

2. The high cavitation resistance centrifugal pump according to claim 1, characterized in that: One end of the central shaft (66) is fixedly connected to the other side of the wheel disc (65), and the central shaft (66) passes through the middle of the pump cover body (4).

3. The high cavitation resistance centrifugal pump according to claim 2, characterized in that: A bearing (43) is fixedly mounted on the other end of the central shaft (66), and a first fastening ring (42) and a second fastening ring (44) are fixedly clamped on the outer side of the bearing (43).

4. The high cavitation resistance centrifugal pump according to claim 3, characterized in that: The first fastening ring (42) and the second fastening ring (44) are fixedly connected by bolts, and one end of the pump cover body (4) is threadedly connected to two groups of threaded rods (41).

5. The high cavitation resistance centrifugal pump according to claim 4, characterized in that: The first fastening ring (42) and the second fastening ring (44) abut against one side of the pump cover body (4) via the threaded rod (41).

6. The high cavitation resistance centrifugal pump according to claim 5, characterized in that: The end pipe (5) is fixedly connected to one side of the pump cover body (4) by means of bolts, and the pump cover body (4) is fixedly connected to one side of the base frame (1) by means of bolts.

7. The high cavitation resistance centrifugal pump according to claim 6, characterized in that: The driving device (2) is fixedly connected to the middle part of the upper side of the base frame (1), and the output shaft of the driving device (2) and one end of the central shaft (66) are fixedly mounted via a key.

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