Novel horizontal small-flow pump

Abstract

The utility model discloses a novel horizontal small-flow pump and belongs to the technical field of industrial centrifugal pumps. The centrifugal pump comprises a pump body and a pump cover, the pump cover is connected to the side of the pump body, a pump inlet is formed in the pump body in the horizontal direction, a pump outlet is formed in the pump body in the vertical direction, the pump cover is further connected with a bearing suspension, and a guide vane assembly and a rotating impeller are fixed between the pump body and the pump cover. The guide vane assembly comprises an annular guide vane and a guide vane end plate, the annular guide vane and the guide vane end plate are jointly connected to the pump cover through a limiting pin, and a plurality of downwards-concave liquid outlet flow channels are annularly and evenly distributed in the annular guide vane. According to the utility model, the performance of the small-caliber and small-flow pump can be improved, the processing cost is reduced, the processing period is shortened, the efficiency and quality of the pump are improved, and particularly the maintenance and shutdown time can be shortened.

Description

Technical Field

[0001] The utility model belongs to the technical field of industrial centrifugal pumps, and in particular relates to a novel horizontal small flow pump. Background Art

[0002] In the process of petrochemical industry, especially heavy chemical industry, a large number of ultra-low specific speed pumps with small flow and high head (such as flow Q≤0.5m 3 Existing horizontal (OH1 / OH2) low-flow centrifugal pumps typically operate at low flow rates by controlling valve opening, sacrificing energy to meet the basic process requirements. This control method suffers from low reliability and high excess energy consumption.

[0003] The shortcomings of the existing structure are as follows: Currently, most horizontal centrifugal pumps have a volute structure. Liquid entering through the suction port is thrown out by the impeller and directly enters the volute. The volute then converts the kinetic energy into pressure energy before it flows out through the outlet. Small-diameter, low-flow pumps with this structure have small outlet channels (even ∅1mm), which cannot be cast. Therefore, machining the outlet channels of small-flow, small-diameter pumps requires high-precision machine tools and custom-made special tools. The pump outlet channels are small and long in diameter, which is costly and difficult to process, and prone to positional deviation during drilling. When high-speed liquid encounters a step, it will rotate in the opposite direction, forming a resistance wall that blocks the flow of liquid behind it, resulting in reduced pump performance and efficiency, which has a significant impact on small-flow, small-diameter pumps.

[0004] In addition, the outlet b2 of the small-diameter, small-flow pump impeller is small (even ∅1.5mm), and casting (hot processing) is prone to sand holes, cracks, sand sticking, etc., resulting in a particularly low casting yield, high cost, and a long processing cycle. Utility Model Content

[0005] The present invention aims to solve the above-mentioned problems, remedy the deficiencies of the prior art, and provide a novel horizontal small-flow pump. The present invention can improve the performance of small-caliber and small-flow pumps, reduce processing costs, shorten processing cycles, improve pump efficiency and quality, and especially shorten maintenance and downtime.

[0006] In order to achieve the above-mentioned purpose, the present utility model adopts the following technical solutions.

[0007] The utility model provides a novel horizontal small-flow pump, comprising a pump body and a pump cover, wherein the pump cover is connected to the side of the pump body, the pump body is provided with a pump inlet in the horizontal direction and a pump outlet in the vertical direction, the pump cover is also connected to the bearing suspension, and a guide vane assembly and a rotating impeller are fixed between the pump body and the pump cover, characterized in that the guide vane assembly comprises an annular guide vane and a guide vane end plate, the annular guide vane and the guide vane end plate are jointly connected to the pump cover by a limit pin, and a plurality of concave liquid outlet channels are evenly distributed on the annular guide vane.

[0008] Furthermore, the rotating impeller is a small-opening split combined welded structure, which is composed of an impeller front cover plate and an impeller rear cover plate. Multiple blades are arranged on the impeller rear cover plate. The impeller front cover plate is processed with multiple long through holes consistent with the blade curves. The blades on the impeller rear cover plate are embedded in the long through holes and then combined into one by fusion welding.

[0009] Furthermore, an axial sealing component is embedded in the pump cover.

[0010] Furthermore, there is a sufficiently large annular space between the pump body and the pump cover to control the flow rate of the medium from the outlet of the guide vane assembly to the pump outlet.

[0011] Furthermore, the bearing suspension includes a pump shaft, a bearing body, a rolling bearing, and an oil lifter. The bearing body is connected to the end of the pump cover. The pump shaft passes through the interior of the bearing body and the pump cover and is connected to the rotating impeller. The rolling bearing is arranged at both ends of the pump shaft corresponding to the bearing body. The rolling bearing is connected to the bearing body and cooperates with the pump shaft. The oil lifter is arranged on the pump shaft inside the bearing body.

[0012] Furthermore, bearing isolators are provided at both ends of the bearing body.

[0013] The beneficial effects of the utility model.

[0014] This new design improves the performance of small-caliber, low-flow pumps, reduces processing costs, shortens processing cycles, improves pump efficiency and quality, and particularly reduces maintenance and downtime. When the pump flow needs to be increased or decreased, simply replacing the annular guide vanes in the pump guide vane assembly can meet the process requirements, without having to replace the rotating impeller and guide vane end plate, making it suitable for some special operating conditions.

[0015] The rotating impeller is a welded assembly, which effectively guarantees the outlet size and tolerance of the rotating impeller, ensuring the flow rate of the fluid after work is performed, and ultimately ensuring the required head is achieved. This utility model has high hydraulic efficiency, low flow resistance in the flow area, saves costs and ensures construction time, with significant economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0017] Figure 1 It is a schematic diagram of the cross-sectional structure of the entire utility model.

[0018] Figure 2 It is a schematic diagram of the blasting structure of the guide vane assembly of the present utility model.

[0019] Figure 3 It is a partial side sectional schematic diagram of the impeller front cover of the utility model.

[0020] Figure 4 It is a partial view of the impeller front cover of the present utility model.

[0021] Figure 5 It is a partial side sectional schematic diagram of the impeller rear cover of the utility model.

[0022] Figure 6 It is a partial view of the impeller rear cover of the utility model.

[0023] Markings in the figure: 1 is the pump body, 2 is the pump cover, 3 is the pump inlet, 4 is the pump outlet, 5 is the annular guide vane, 6 is the guide vane end plate, 7 is the rotating impeller, 8 is the limit pin, 9 is the concave liquid outlet channel, 10 is the impeller front cover plate, 11 is the impeller rear cover plate, 12 is the blade, 13 is the long through hole, 14 is the axial sealing component, 15 is the annular space, 16 is the pump shaft, 17 is the bearing body, 18 is the rolling bearing, 19 is the oil lifter, and 20 is the bearing isolator. DETAILED DESCRIPTION

[0024] As shown in the accompanying drawings, this embodiment provides a new type of horizontal small-flow pump, including a pump body 1 and a pump cover 2. The pump cover 2 is connected to the side of the pump body 1. The pump body 1 is provided with a pump inlet 3 in the horizontal direction and a pump outlet 4 in the vertical direction. The pump cover 2 is also connected to the bearing suspension. A guide vane assembly and a rotating impeller 7 are fixed between the pump body 1 and the pump cover 2.

[0025] The guide vane assembly includes an annular guide vane 5 and a guide vane end plate 6. The annular guide vane 5 and the guide vane end plate 6 are connected to the pump cover 2 through a limit pin 8. A plurality of concave liquid outlet channels 9 are evenly distributed in an annular manner on the annular guide vane 5.

[0026] The rotating impeller 7 is a small-opening, split, welded structure, consisting of a front impeller shroud 10 and a rear impeller shroud 11. Multiple blades 12 are mounted on the rear impeller shroud 11. The front impeller shroud 10 is machined with multiple elongated through-holes 13 that align with the curves of the blades 12. Blades 12 from the rear impeller shroud 11 are inserted into these elongated through-holes 13 and then welded together to form a single unit. The inner and outer diameters of the annular guide vanes 5, the depth of the concave liquid discharge channel 9, the throat width, the width of the discharge channel outlet, and the number of channels are determined based on the basic parameters of the rotating impeller 7 and the operating conditions.

[0027] An axial sealing component 14 is embedded in the pump cover 2 , and a sufficiently large annular space 15 is provided between the pump body 1 and the pump cover 2 to control the flow rate of the medium from the outlet of the guide vane assembly to the pump outlet 4 .

[0028] The bearing suspension includes a pump shaft 16, a bearing body 17, a rolling bearing 18, and an oil lifter 19. The bearing body 17 is connected to the end of the pump cover 2. The pump shaft 16 passes through the interior of the bearing body 17 and the pump cover 2 and is connected to the rotating impeller 7. The rolling bearings 18 are arranged at both ends of the pump shaft 16 corresponding to the bearing body 17. The rolling bearings 18 are connected to the bearing body 17 and cooperate with the pump shaft 16. The oil lifter 19 is arranged on the pump shaft 16 inside the bearing body 17. Bearing isolators 20 are also provided at both ends of the bearing body 17.

[0029] The medium flows into the pump from the horizontal pump inlet 3, and the rotating impeller 7 performs work to increase the flow rate of the medium. The medium is introduced into the guide vane assembly by the rotating impeller 7, and is decelerated by diffusion through the concave liquid outlet channel 9, so that the medium flows into the annular space 15 between the pump body 1 and the pump cover 2, and is decelerated again, and finally reaches a safe flow rate at the outlet.

[0030] It can be understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the implementation methods of the present invention. Ordinary technicians in this field should understand that the present invention can still be modified or replaced by equivalents to achieve the same technical effects; as long as the use requirements are met, they are within the scope of protection of the present invention.

Claims

1. A novel horizontal small flow pump, comprising a pump body (1) and a pump cover (2), wherein the pump cover (2) is connected to the side of the pump body (1), the pump body (1) is provided with a pump inlet (3) in the horizontal direction and a pump outlet (4) in the vertical direction, the pump cover (2) is further connected to a bearing suspension, a guide vane assembly and a rotating impeller (7) are fixed between the pump body (1) and the pump cover (2), and is characterized in that: The guide vane assembly comprises an annular guide vane (5) and a guide vane end plate (6); the annular guide vane (5) and the guide vane end plate (6) are connected to the pump cover (2) via a limit pin (8); and a plurality of concave liquid outlet channels (9) are evenly distributed in an annular manner on the annular guide vane (5).

2. A novel horizontal small flow pump according to claim 1, characterized in that: The rotating impeller (7) is a small-opening split combined welded structure, which is composed of an impeller front cover plate (10) and an impeller rear cover plate (11). A plurality of blades (12) are arranged on the impeller rear cover plate (11). The impeller front cover plate (10) is processed with a plurality of long through holes (13) that are consistent with the curves of the blades (12). The blades (12) on the impeller rear cover plate (11) are embedded in the long through holes (13) and then combined into one piece by fusion welding.

3. A novel horizontal small flow pump according to claim 1, characterized in that: An axial sealing component (14) is embedded in the pump cover (2).

4. A novel horizontal small flow pump according to claim 1, characterized in that: There is a sufficiently large annular space (15) between the pump body (1) and the pump cover (2) to control the flow rate of the medium from the outlet of the guide vane assembly to the pump outlet (4).

5. A novel horizontal small flow pump according to claim 1, characterized in that: The bearing suspension comprises a pump shaft (16), a bearing body (17), a rolling bearing (18), and an oil lifter (19); the bearing body (17) is connected to the end of the pump cover (2); the pump shaft (16) passes through the interior of the bearing body (17) and the pump cover (2) and is connected to the rotating impeller (7); the rolling bearing (18) is arranged at both ends of the pump shaft (16) corresponding to the bearing body (17); the rolling bearing (18) is connected to the bearing body (17) and cooperates with the pump shaft (16); and the oil lifter (19) is arranged on the pump shaft (16) inside the bearing body (17).

6. A novel horizontal small flow pump according to claim 5, characterized in that: Bearing isolators (20) are also provided at both ends of the bearing body (17).

Images