High-efficiency energy-saving large vertical condensate pump

Abstract

The utility model belongs to the technical field of vertical condensate pumps, and particularly relates to a high-efficiency energy-saving large vertical condensate pump. The utility model provides a novel high-capacity vertical condensate pump which is efficient, energy-saving, reliable in structure and stable in operation. The centrifugal pump is characterized in that the upper end and the lower end of a first-stage impeller are suction ends, and the side of the first-stage impeller is a discharge end; the lower end of the flow guide shell is connected with the outlet end of a first-stage spiral shell; the inlet end of the first-stage spiral shell corresponds to the discharge end of the first-stage impeller; the inlet end of the first-stage spiral shell is further provided with two suction horn pipes corresponding to the two suction ends of the first-stage impeller respectively.

Description

TECHNICAL FIELD

[0001] The utility model belongs to vertical condensate pump technical field, concretely relates to a kind of high-efficiency energy-saving large vertical condensate pump. BACKGROUND

[0002] In the development of large-scale thermal power industry, petrochemical industry, nuclear power and other industries, the performance parameters capacity of corresponding large vertical condensate pump in condensate system generated after steam power generation is increasingly improved, and the requirement of equipment energy saving and emission reduction is increasingly valued, the efficiency of existing condensate pump and equipment operation reliability are improved, condensate pump operating parameters are optimized, equipment energy saving and consumption reducing demand is met, therefore, it is urgent to develop and improve high-efficiency energy-saving condensate pump, structure reliable and eliminate low-frequency vibration when condensate pump frequency conversion runs, convenient to overhaul, low maintenance cost meet the pump equipment for the production and operation of various industries. SUMMARY

[0003] The utility model is just to solve the above problems, provide a kind of high-efficiency energy-saving, structure reliable, the novel large-capacity vertical condensate pump of stable operation.

[0004] In order to realize the above-mentioned purpose of the utility model, the utility model adopts the following technical scheme, the utility model includes pump body, the upper part of pump body is power end, the middle part of pump body is the spout section with pump outlet, the lower part of pump body is the outer cylinder with pump inlet, the lower end of pump shaft of power end passes through spout section and extends into outer cylinder, and is connected with secondary impeller group and primary impeller from top to bottom in sequence, the outer of secondary impeller group is provided with the flow guide shell matched with secondary impeller group, characterized by: the upper and lower ends of primary impeller are all set as suction end, and the side of primary impeller is spout end;The lower end of flow guide shell is connected with the outlet end of primary spiral shell;The inlet end of primary spiral shell corresponds with the spout end of primary impeller;The inlet end of primary spiral shell is also provided with two suction horn pipes corresponding with the two suction ends of primary impeller respectively.

[0005] As a preferred scheme of the utility model, the inlet diameter of the two suction horn pipes is D1, the suction horn pipe is set as flat section after being gradually changed by circular arc from inlet to inside, the diameter of flat section is D2, the inlet diameter of the suction end of primary impeller is D3, and the contraction ratio of suction horn pipe is D2 / D1=0.62-0.70, and at the same time, the size matching of the diameter of inlet end of primary impeller and flat section of suction horn pipe is set as D3 / D2=1.0-1.05.

[0006] As another preferred scheme of the utility model, the primary spiral shell includes horizontal spiral section corresponding with the spout end of primary impeller, and horizontal spiral section is connected with vertical spiral section by circular arc transition;Vertical spiral section and folding spiral section are connected by circular arc transition, and the folding end of folding spiral section is connected with the lower end of flow guide shell.

[0007] As a third preferred scheme of the utility model, the extension section is arranged between the blade of the secondary impeller and the suction end of the secondary impeller, and the length of the extension section is set as L1=20-30mm.

[0008] As a fourth preferred scheme of the utility model, the distance between the blade outlet of the secondary impeller and the inlet of the guide shell corresponding to the blade is set as L2=40-60mm.

[0009] As a fifth preferred scheme of the utility model, the shaft sleeve is arranged on the pump shaft, the guide bearing is arranged on the guide shell, the guide bearing is made of graphite-fluorine plastic composite material, and the gap of 0.15-0.25mm is arranged between the shaft sleeve and the guide bearing.

[0010] As a sixth preferred scheme of the utility model, the power end comprises a support seat, the upper end of the support seat is connected with the motor of the pump shaft, the bearing of the pump shaft is arranged in the support seat, the cooling oil chamber is arranged outside the bearing, the water cooling coil is arranged in the cooling oil chamber, and the cooling water inlet and the cooling water outlet of the water cooling coil are arranged outside the cooling oil chamber.

[0011] As a seventh preferred scheme of the utility model, the pump shaft comprises the upper shaft connected with the motor and the lower shaft arranged in the outer cylinder, and the upper shaft and the lower shaft are connected through the shaft coupling and the half split snap ring.

[0012] The utility model discloses the beneficial effects that 1, the first-stage impeller adopts double suction structure, and is matched with two suction horn pipes, so that fluid is evenly entered the impeller from both sides, improves the anti-cavitation ability of the pump, reduces the suction loss, and is suitable for large flow working condition.

[0013] 2, the structure of the suction horn pipe is optimized, the fluid stability is improved, the contraction ratio (D2 / D1=0.62-0.70) and the matching impeller inlet diameter (D3 / D2=1.0-1.05) are set, the fluid is kept steady flow before entering the impeller, the turbulent flow and energy loss are reduced, the suction performance and the anti-cavitation ability of the pump are improved.

[0014] 3, the circular arc transition connection of transverse spiral section, vertical spiral section and folding spiral section is adopted, the radial part flow channel of the outer periphery of the first-stage impeller outlet is inverted trapezoidal, the flow channel of inverted trapezoidal shape is more in line with the water flow path after the water of the impeller outlet, more pressure energy can be recycled in the vortex chamber, and the pump efficiency is improved.

[0015] 4、Increase the extension section between the secondary impeller blade and the suction end by L1=20~30mm, so that the liquid does to work in advance at the suction end of the impeller, improve the hydraulic performance, increase the lift of the pump and improve the operation efficiency. By setting the distance between the blade outlet of the secondary impeller and the blade inlet of the guide shell as L2=40~60mm, the uniform fluid flow is ensured, the influence of the blade wake is reduced, and the operation stability and hydraulic efficiency of the pump are improved.

[0016] 5、The guide bearing is made of graphite-fluorine plastic composite material, and the gap of 0.15~0.25mm is reasonably arranged, so that stable water film lubrication is formed, the wear of the shaft sleeve is reduced, the service life of the bearing is improved, and the maintenance cost is reduced.

[0017] 6、By setting the cooling oil chamber outside the bearing, and installing the water cooling coil in the cooling oil chamber, the bearing parts can be effectively cooled, the bearing temperature is reduced, the wear caused by high temperature is reduced, and the long-term operation reliability of the pump is improved.

[0018] 7、The upper shaft and the lower shaft are designed in a split type, and are connected through the shaft coupling and the half split ring, so that the alignment accuracy of the two shafts is ensured, the transmission stability is improved, and the equipment reliability and maintainability are improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of the utility model.

[0020] Figure 2 It is a structural schematic view of the secondary impeller and the guide shell.

[0021] Figure 3 It is a structural schematic view of the cooling oil chamber.

[0022] Figure 4 It is a structural schematic view of the primary impeller and the primary spiral shell.

[0023] In the drawings, 1 is an outer cylinder, 2 is a primary impeller, 3 is a primary spiral shell, 4 is a secondary impeller group, 5 is a guide shell, 6 is a pump shaft, 7 is a discharge section, 8 is a pump outlet, 9 is a cooling oil chamber, 10 is a power end, 11 is a pump inlet, 12 is a folding spiral section, 13 is a vertical spiral section, 14 is a horizontal spiral section, 15 is a suction horn pipe, 16 is a water cooling coil, 17 is a guide bearing, 18 is a shaft sleeve, and 19 is a blade. DETAILED DESCRIPTION

[0024] The utility model discloses a pump body, the upper portion of pump body is power end 10, the middle part of pump body is the ejection section 7 with pump export 8, the lower part of pump body is the outer cylinder 1 with pump import, and the lower end of pump shaft 6 of power end 10 passes through ejection section 7 and extends into outer cylinder 1 and is connected with secondary impeller group 4 and first stage impeller 2 from top to bottom in proper order, the outer of secondary impeller group 4 is provided with the guide vane casing 5 of cooperation with secondary impeller group 4, the upper and lower both ends of first stage impeller 2 are all set up to suction end, and the side of first stage impeller 2 is the ejection end, the lower end of guide vane casing 5 is connected with the export end of first stage spiral shell 3, the import end of first stage spiral shell 3 corresponds with the ejection end of first stage impeller 2, and the import end of first stage spiral shell 3 is also provided with two suction horn pipes 15 corresponding with the two suction ends of first stage impeller 2 respectively.

[0025] The inlet diameter of the two suction horn pipes 15 is D1, the suction horn pipe 15 is provided with a flat section after the inlet is inwardly connected through a circular arc, the diameter of the flat section is D2, the inlet diameter of the suction end of the first stage impeller 2 is D3, and the contraction ratio of the suction horn pipe 15 is D2 / D1=0.62-0.70, and meanwhile, the size matching of the inlet end of the first stage impeller 2 and the diameter of the flat section of the suction horn pipe 15 is D3 / D2=1.0-1.05.

[0026] The first stage spiral shell 3 includes a transverse spiral section 14 corresponding to the ejection end of the first stage impeller 2, the transverse spiral section 14 is connected with a vertical spiral section 13 through a circular arc, and the vertical spiral section 13 is connected with a converging spiral section 12 through a circular arc, and a converging end of the converging spiral section 12 is connected with the lower end of the guide vane casing 5.

[0027] An extension section is arranged between the blade 19 of the secondary impeller and the suction end of the secondary impeller, and the length of the extension section is set as L1=20-30mm.

[0028] The distance between the outlet of the blade 19 of the secondary impeller and the inlet of the guide vane casing 5 corresponding to the blade 19 is set as L2=40-60mm.

[0029] The pump shaft 6 is provided with a shaft sleeve 18, the guide bearing 17 is arranged on the guide vane casing 5, the guide bearing 17 is made of graphite-fluorine plastic composite material, and a gap of 0.15-0.25mm is arranged between the shaft sleeve 18 and the guide bearing 17.

[0030] The power end 10 includes a support seat, the upper end of the support seat is connected with the motor of the pump shaft 6, bearings of the pump shaft 6 are arranged in the support seat, a cooling oil chamber 9 is arranged outside the bearings, a water cooling coil pipe 16 is arranged in the cooling oil chamber 9, and the cooling water inlet and the cooling water outlet of the water cooling coil pipe 16 are arranged outside the cooling oil chamber 9.

[0031] The pump shaft 6 comprises an upper shaft connected with the motor and a lower shaft arranged in the outer cylinder 1, and the upper shaft and the lower shaft are connected through a shaft coupling and a half snap ring.

[0032] The first-stage spiral shell 3 is integrally provided with an upper suction horn pipe 15 corresponding to the suction inlet at the upper portion of the first-stage impeller 2. In order to facilitate assembly, the lower suction horn pipe 15 is fixed to the lower portion of the first-stage spiral shell 3 by using a connecting piece. The upper and lower suction horn pipes 15 and the first-stage spiral shell 3 form a cavity, and the first-stage impeller 2 is arranged in the cavity and sleeved to the lower end of the pump shaft 6. The upper and lower sealing rings of the first-stage impeller 2 are respectively arranged at the sealing gaps of the matching portions of the horn pipe 15 and the shell of the first-stage spiral shell 3. After the liquid flows through the first-stage impeller 2 from the suction horn pipe 15, the liquid flows into the first-stage spiral shell 3 and then enters the next-stage secondary impeller. The first-stage spiral shell 3 is connected with the flow guide shell 5. After the liquid flows through the secondary impeller set 4, the kinetic energy of the liquid in the flow guide shell 5 is converted into the potential energy of the liquid, that is, the lift of the pump is increased. The liquid flows along the gradually increasing internal shape and flow area of the flow guide shell 5 and then flows out of the flow guide shell 5. The liquid enters the discharge section 7 and then flows out of the pump outlet 8. The flow direction of the liquid changes from downward to upward and then changes to horizontal and flows out of the pump outlet 8.

[0033] The shapes of the horn pipes in the central region of the suction horn pipe 15 and the first-stage spiral shell 3 are designed to be the same as the flow lines of the horn pipes on the upper and lower sides, that is, the circular arc segments from D1 to D2, the straight segments behind the D2 diameter, the contraction ratio D2 / D1 of the large diameter D1 to the small diameter D2 is 0.62-0.70, and the size D3 of the impeller inlet is matched with the size D2, that is, D3 / D2=1.0-1.05.

[0034] The radial flow channel of the first-stage spiral shell 3 located at the outer circumferential portion of the outlet of the first-stage impeller 2 is designed as an inverted trapezoid. The inverted trapezoidal flow channel is more in line with the water flow path after the water flows out of the impeller, and more pressure energy can be recovered in the vortex chamber, so that the pump efficiency is improved. The liquid flows in the circumferential direction and the radial direction in the vortex chamber, slowly changes to axial flow in the double spiral pipe, and then enters the next-stage secondary impeller set 4 and the flow guide shell 5.

[0035] The blade 19 of the suction end of the secondary impeller set 4 is designed to be more forward than the conventional design, that is, L1=20-30 mm, so that the blade 19 does work for the liquid in advance, the hydraulic performance of the pump is improved, and the lift of the pump is increased by 3-5 m.

[0036] The distance L2 between the outlet edge of the blade 19 of the secondary impeller set and the inlet edge of the blade 19 of the flow guide shell 5 is determined by optimization selection as 40-60 mm, which is beneficial to uniform liquid flow and is not affected by the outlet wake of the blade 19.

[0037] The shaft sleeve 18 and the guide bearing 17 are arranged between the guide shell 5 and the pump shaft 6, the guide bearing 17 adopts graphite-fluorine plastic composite material (existing technology that can be purchased), different from rubber and engineering plastic, the graphite-fluorine plastic composite material has the characteristics of soft material, good lubricating performance, no wear of the shaft sleeve 18 and long service life; there is a proper gap between the shaft sleeve 18 and the guide bearing 17 to form a hydraulic support, and the gap plays a water lubricating role, the optimal design gap is 0.15-0.25 mm through the design of the gap and product operation test, and the rigidity of the pump rotor is enhanced, and the stable operation of the pump is facilitated.

[0038] The utility model discloses a cooling oil room 9, its characteristics is, cooling oil room 9 uses water cooling coil 16 to cool, and the coil does not need to distort, ensures that the water pipe is not easy to break, and the water cooling coil 16 interface mode is designed as radial water inlet and outlet from traditional axial water inlet and outlet, reduces the axial space of bearing parts that occupies, is favorable to shorten the height of pump upper portion, is favorable to pump stable operation.

[0039] It can be understood that the above specific description of the utility model is only used for illustrating the utility model and is not limited to the technical scheme described in the utility model embodiment, and the person skilled in the art should understand that the utility model can still be modified or replaced equivalently to achieve the same technical effect, as long as the use needs are met, and it is within the protection scope of the utility model.

Claims

1. A high-efficiency and energy-saving large vertical condensate pump, comprising a pump body, an upper part of which is a power end (10), a middle part of which is a discharge section (7) with a pump outlet (8), and a lower part of which is an outer cylinder (1) with a pump inlet. The lower end of the pump shaft (6) of the power end (10) passes through the discharge section (7) and extends into the outer cylinder (1), connecting from top to bottom to a secondary impeller assembly (4) and a primary impeller (2). A guide shell (5) cooperating with the secondary impeller assembly (4) is provided outside the secondary impeller assembly (4). The pump body is characterized in that: The upper and lower ends of the first-stage impeller (2) are both set as suction ends, and the side of the first-stage impeller (2) is the discharge end; the lower end of the guide shell (5) is connected to the outlet end of the first-stage spiral shell (3); the inlet end of the first-stage spiral shell (3) corresponds to the discharge end of the first-stage impeller (2); the inlet end of the first-stage spiral shell (3) is also provided with two suction horn pipes (15) corresponding to the two suction ends of the first-stage impeller (2).

2. The high-efficiency and energy-saving large vertical condensate pump according to claim 1, characterized in that: The inlet diameter of the two suction horn tubes (15) is D1. The suction horn tube (15) is set as a straight section after the inlet passes through the arc. The diameter of the straight section is D2. The inlet diameter of the suction end of the first stage impeller (2) is D3. The contraction ratio of the suction horn tube (15) is D2 / D1=0.62~0.

70. At the same time, the size matching between the inlet end of the first stage impeller (2) and the diameter of the straight section of the suction horn tube (15) is set as D3 / D2=1.0~1.

05.

3. The high-efficiency and energy-saving large vertical condensate pump according to claim 1, characterized in that: The first-stage spiral shell (3) includes a transverse spiral section (14) corresponding to the discharge end of the first-stage impeller (2), and the transverse spiral section (14) is connected to the vertical spiral section (13) by an arc transition; the vertical spiral section (13) is connected to the converging spiral section (12) by an arc transition, and the converging end of the converging spiral section (12) is connected to the lower end of the guide shell (5).

4. The high-efficiency and energy-saving large vertical condensate pump according to claim 1, characterized in that: An extension section is provided between the blade (19) of the secondary impeller and the suction end of the secondary impeller, and the length of the extension section is set to L1=20~30mm.

5. A high-efficiency, energy-saving large-scale vertical condensate pump according to claim 1, characterized in that: The distance between the outlet of the blade (19) of the secondary impeller and the inlet of the guide shell (5) corresponding to the blade (19) is set to L2 = 40~60mm.

6. A high-efficiency and energy-saving large vertical condensate pump according to claim 1, characterized in that: A bushing (18) is provided on the pump shaft (6), and a guide bearing (17) is provided on the flow guide shell (5). The guide bearing (17) is made of graphite-fluoroplastic composite material, and a gap of 0.15 to 0.25 mm is provided between the bushing (18) and the guide bearing (17).

7. A high-efficiency and energy-saving large vertical condensate pump according to claim 1, characterized in that: The power end (10) includes a support base, the upper end of which is a motor connected to the pump shaft (6); the support base is provided with a bearing for the pump shaft (6); a cooling oil chamber (9) is provided outside the bearing, and a water cooling coil (16) is provided inside the cooling oil chamber (9), with the cooling water inlet and cooling water outlet of the water cooling coil (16) located outside the cooling oil chamber (9).

8. A high-efficiency, energy-saving large-scale vertical condensate pump according to claim 1, characterized in that: The pump shaft (6) includes an upper shaft connected to the motor and a lower shaft disposed inside the outer cylinder (1). The upper shaft and the lower shaft are connected by a coupling and a split snap ring.

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