JP3124447U - Axial flow pump for water treatment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an axial flow pump for water treatment in which main parts of an axial flow pump are made into one assembly and vertical shaft installation, horizontal shaft installation or oblique shaft installation is possible.
A pair of bearings (18, 19) that pivotally support an upper portion of a main shaft (9) are arranged in a bearing box (7) at a predetermined interval, and a disk is placed on the main shaft (9) in the vicinity of the bearing box (7). A boss part that externally fits a water draining ring (22), discharges a mechanical seal (23) that is extrapolated to the main shaft (9), is fitted and inserted into the elbow (3), and projects into the recess (A) of the inner peripheral wall (23a) and the flange (23b) connected to the curved wall (3a) are formed, and the impeller (10) is fixed to the tip of the main shaft (9), so that the main shaft (9 ) And the bending of the main shaft (9) that is pivotally supported by the pair of bearings (18, 19) is also reduced. And the assembly of main parts turns into an axial flow pump corresponding to various piping layouts, water can be stopped regardless of the installation direction of a pump by making a mechanical seal (23) non-pour water.
[Selection] Figure 2

Description

  The present invention relates to an axial flow pump for circulation or transfer for performing sewage treatment and advanced treatment. More specifically, the present invention relates to an axial flow pump for water treatment that enables vertical shaft installation, horizontal shaft installation, or oblique shaft installation. .

As shown in FIG. 11, a conventional axial pump used in a conventional sewage treatment plant or water treatment facility uses a roof-mounted vertical axial pump 65. The vertical axial flow pump 65 is driven by the drive unit 66, and the sewage flowing into the suction casing 68 from the water storage tank 67 is discharged from the discharge pipe 69 to the drain pipe 70, and circulated for sewage treatment and advanced treatment. It is transported. In the pipes of sewage treatment plants and water treatment facilities, piping is laid vertically and horizontally in a limited space, making it difficult to secure space for installation of pumps and maintenance space. As a conventional horizontal shaft axial flow pump configured compactly, a main shaft with blades is rotatably supported by a sealed bearing provided in a casing and a submerged bearing supported by a guide blade angle, and the main shaft is used as a prime mover. The connected horizontal-axis axial flow pump is known, for example, as described in Patent Document 1. Further, a lateral shaft axial flow pump in which an axial flow impeller fixed to a cantilevered main shaft is accommodated in a casing and a spiral casing is disposed immediately downstream of the casing is also disclosed in Patent Document 2, for example. It is known. As a means for reducing the height of the vertical axial flow pump, a vertical pump in which guide vanes are provided in the discharge elbow and the pumping pipe is omitted is also known as described in Patent Document 3, for example.
JP 7-63190 A (paragraph number 0007, FIG. 1) JP 2002-257094 A (paragraph number 0003 and paragraph number 0005, FIG. 6) Japanese Patent Laid-Open No. 11-62872 (summary, FIG. 1)

  A conventional horizontal shaft pump that supports the tip of the main shaft with an underwater bearing can reduce vibration of the main shaft and rectify pumping water. In the space inside the water treatment facility, it is difficult to secure a space for installing the pump and a maintenance space. In addition, the cantilever horizontal axis axial flow pump in which a spiral casing is arranged immediately downstream of the conventional casing has a reduced length from the blade outlet to the discharge pipe, and can be installed in a limited space. However, in a pump installation space where piping is laid vertically and horizontally, the place of use is limited. The main shaft is deflected and cannot be used at high speed, and parts and drains that receive water oozing from the bearing are required. The vertical axial flow pump with guide vanes on the discharge elbow can reduce the height, but the drive is installed on the tank, and all parts are placed near the discharge elbow to make the whole compact. It is difficult to make. In this invention, the main parts of the main shaft, bearing box, bearing, and impeller are combined into one assembly, and installation directions such as vertical shaft installation, horizontal shaft installation, oblique shaft installation, etc. can be freely adapted to various piping layouts. An axial flow pump is provided.

  An axial flow pump for water treatment according to the present invention has a main shaft that is ejected from a curved wall of an elbow, and an impeller fixed to a distal end portion of the main shaft is disposed on a suction bell, and a driving machine is disposed at a proximal end portion of the main shaft. A pair of bearings that pivotally support the upper part of the main shaft are arranged at predetermined intervals in the bearing box, and a disc-shaped draining ring is externally fitted to the main shaft near the bearing box and discharged. A mechanical seal that forms a boss part to be inserted into the elbow and a flange part connected to the curved wall is extrapolated to the main shaft, and an impeller is fixed to the tip of the main shaft, and the main shaft, bearing box, bearing, and The main components of the impeller become a single assembly, and it can be used for vertical axis installation, horizontal axis installation, offset inline type horizontal axis installation, and inline type oblique axis installation corresponding to various piping layouts. And the main shaft is cantilevered, the length of the main shaft is shortened, and the axial flow pump becomes compact. The distance between the bearings of the pair of bearings that support the main shaft in a cantilever manner is increased, and the deflection of the main shaft is reduced.

  Then, the pump base is arranged on the curved wall on the back side of the discharge elbow, the annular flange projecting from the middle part of the bearing box is connected to the pump base, and the inner peripheral wall of the discharge elbow passing through the main shaft The boss part of the mechanical seal is protruded at one end, and the mechanical seal is water-free, the discharge elbow has a wide area around the mechanical seal and is easily exposed to water flow. No matter what the installation direction is, there is no air accumulation, and the mechanical seal does not become dry operation. By adopting a non-water-injection mechanical seal as the shaft seal device, water can be stopped regardless of the installation direction of the pump.

  The axial flow pump for water treatment with the main parts of the main shaft, bearing box, bearing and impeller as one assembly is a discharge elbow with a quarter-circular cross-section on a standing circular suction bell. The suction port of the suction bell is opened at the lower end, the discharge port of the discharge elbow is opened to the upper side, and the main shaft penetrating the curved wall on the upper surface side of the discharge elbow is vertically installed. Therefore, it becomes a vertical shaft axial flow pump capable of installing a vertical shaft corresponding to various pipes and casings. Another means for installing the water treatment axial flow pump with the main parts as one assembly is that a discharge elbow having a quarter-circular cross-section is connected to a horizontal circular suction bell. The suction port of the discharge elbow is opened horizontally, the discharge port of the discharge elbow is opened upward, and the main shaft penetrating the curved wall on the lower surface side of the discharge elbow is disposed horizontally. It becomes the installation horizontal axis axial flow pump.

  Another means for installing the water treatment axial flow pump with the main parts as one assembly is that a discharge elbow having a substantially S-shaped cross section is connected to a horizontal circular suction bell, The bell suction port is opened sideways, the discharge elbow discharge port is opened on the upper side, and the main shaft penetrating the curved wall on the lower surface side of the discharge elbow is arranged horizontally. This is an offset in-line horizontal axis axial flow pump. Further, another installation means of the water treatment axial flow pump includes a curved suction bell that opens obliquely upward and laterally, and a discharge elbow whose cross-sectional view that opens obliquely downward and laterally has a generally letter shape. , The suction port of the suction bell and the discharge port of the discharge elbow are opened horizontally on the horizontal line, and the main shaft penetrating the curved wall on the upper surface side of the discharge elbow is inclined. Thus, an in-line oblique shaft installed oblique shaft axial flow pump is obtained.

  The main parts of the main shaft, bearing box, bearing, and impeller are combined into one assembly, and the installation direction such as vertical shaft installation, horizontal shaft installation, oblique shaft installation, etc. can be freely set, and axial flow pumps can be used for various piping layouts. Can be installed. And since all parts are arranged near the discharge elbow and supported by cantilever bearings, the pump as a whole is compact, piping in the corridor is simplified, maintenance space can be secured, and the corridor in the treatment plant can be secured. The pump can be installed in a limited space. Further, since the distance between the bearings is increased, the bending of the main shaft is small, and by adopting a non-poured water mechanical seal as the shaft seal device, water can be stopped regardless of the installation direction of the pump. Furthermore, since the periphery of the mechanical seal is wide and easily exposed to the water flow in the underwater portion, there is no air accumulation regardless of the installation direction of the axial flow pump, and the mechanical seal does not operate dry.

A water treatment axial flow pump according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a vertical sectional view of a vertical shaft axial flow pump installed on a vertical shaft. A discharge elbow 3 having a semicircular sectional shape is connected to the bell 2, the suction port 4 of the suction bell 2 is opened at the lower end, and the discharge port 5 of the discharge elbow 3 is opened to the upper side. .
A pump base 6 is arranged on the curved wall 3a on the back side of the discharge elbow 3, and an annular flange 8 projecting from an intermediate portion of the bearing box 7 is connected to the pump base 6 with a bolt or the like, and the main shaft 9 is attached. It is supported by a bearing box 7. The main shaft 9 supported on the bearing box 7 passes through the curved wall 3a of the discharge elbow 3 and is discharged into the elbow 3 so that the impeller 10 fixed to the lower end of the main shaft 9 is attached to the inside of the suction bell 2. It is extended to. A plurality of guide vanes 11 for rectification are arranged on the suction bell 2, and an impeller cap 12 supported on the guide vanes 11 is provided on a vane boss 13 of the impeller 10. A drive base 14 is mounted on a pump base 6 provided on the curved wall 3 a of the discharge elbow 3 while holding a flange 8 of the bearing box 7. A drive unit 15 is supported on the drive base 14. The drive shaft 16 is connected to the upper end portion of the main shaft 9 via a shaft coupling 17.

FIG. 2 is a longitudinal sectional view of a main part in which a main part is assembled as a main part by incorporating a bearing box, a bearing, and an impeller into the main shaft. The upper part of the main shaft 9 is pivotally attached by a pair of bearings 18 and 19 having a longer length, and a pair of bearing box lids 20 and 21 are fitted to both ends of the bearing box 7 and sealed. A disk-shaped draining ring 22 is externally fitted in the vicinity of the bearing box lid 21 on the impeller 10 side, and even if water leaks into the pump mount 6, it is blocked by the draining ring 22 and enters the bearing box 7. There is nothing to do.
A mechanical seal 23 is externally mounted on the main shaft 9 below the draining ring 22, and the tip of the main shaft 9 is inserted into the blade boss 13 of the impeller 10 and screwed with a nut 24. The impeller 10 is incorporated and the main parts are made into one assembly. Since the main shaft 9 is cantilevered and no underwater bearing is required, the length of the main shaft 9 is shortened, and the vertical shaft axial flow pump 1 becomes compact. Since the distance between the bearings of the pair of bearings 18 and 19 disposed at a predetermined interval in the bearing housing 7 is increased, the lateral vibration during rotation of the main shaft 9 is reduced.

  FIG. 3 is an enlarged view of the main part of a vertical axial flow pump that hangs the main shaft on the discharge elbow, and the mechanical seal 23 to be externally mounted on the main shaft 9 has a flange portion 23b and boss portions 23a on both sides thereof. The boss 23a of the mechanical seal 23 is fitted into the through hole 25 of the curved wall 3a on the back surface of the discharge elbow 3, and the flange 23b is discharged and connected to the curved wall 3a on the upper surface side of the elbow 3 with a bolt or the like. As water injection. When the gland packing is used, a component that receives water leakage and a drain are required. However, by adopting the non-poured water mechanical seal 23 as a shaft seal device, water can be stopped regardless of the installation direction of the pump. As shown in FIG. 3, a recess A is formed in the inner peripheral wall of the through hole 25 of the main shaft 9 of the discharge elbow 3, and one end of the boss portion 23 a of the mechanical seal 23 is projected. Since the periphery of the boss portion 23a of the non-poured mechanical seal 23 is wide and easily exposed to water flow in the underwater portion, there is no air accumulation regardless of the installation direction of the pump, and the mechanical seal 23 does not perform dry operation. .

  FIG. 4 shows an embodiment of a vertical axial flow pump installed outside the water storage tank. A vertical axial flow pump 1 for circulation or transfer for performing advanced treatment on a water storage tank 26 such as a sewage treatment plant is a vertical axis. A suction elbow 29 is connected to a horizontal water suction pipe 27 installed through the side wall of the water storage tank 26 via a suction valve 28, and the rear end bent upward of the suction elbow 29 is connected to a vertical axial pump. 1 suction bell 2 is connected. A discharge pipe 30 arranged horizontally is connected to the discharge elbow 3 of the vertical axial flow pump 1, and the discharge pipe 30 is connected to a drain pipe 32 via a discharge valve 31. The vertical axial flow pump 1 is driven by the drive unit 15 to extract the sewage from the water storage tank 26 and circulate the sewage for advanced treatment or transfer it to the next processing unit.

  FIG. 5 is a side view of a horizontal axis axial flow pump installed on the horizontal axis. The horizontal axis axial flow pump 33 is connected to a horizontally disposed circular suction bell 34 with a discharge elbow 35 having a semicircular sectional view. The suction port 36 of the suction bell 34 is opened laterally, and the discharge port 37 of the discharge elbow 35 is opened upward. A pump base 38 is arranged on the curved wall 35a on the lower surface side of the discharge elbow 35, and the bearing box 7 incorporated in the main shaft 9 having the structure shown in FIG. 2 is connected to the pump base 38. The main shaft 9 projecting from the discharge elbow 35 is disposed horizontally. Although not shown, a recess A is formed in the inner peripheral wall of the discharge elbow 35 through which the main shaft 9 is inserted. The main shaft 9 is connected to the drive shaft 41 of the drive machine 40 through the shaft coupling 39 at the base end portion, and the horizontal shaft axial flow pump 33 and the drive machine 40 are mounted on the gantry 42 so As a shaft installation. FIG. 6 shows an embodiment of a horizontal axial flow pump installed outside the water storage tank. A horizontal axis axial flow pump 33 is installed in the water storage tank 26 and a water suction pipe 27 disposed in the water storage tank 26. The suction bell 34 is connected to the suction valve 28 via the suction valve 28. A vertical discharge pipe 43 is connected to the discharge elbow 35 of the horizontal axial flow pump 33, and the discharge pipe 43 is connected to an upper pumping pipe 45 through a discharge valve 44. The horizontal axis axial flow pump 33 is driven by the drive unit 40, and the sewage in the water storage tank 26 is drained from the pumping pipe 45 to the drain pipe 46.

  FIG. 7 is a vertical cross-sectional view of a horizontal axis axial flow pump installed on the horizontal axis. The horizontal axis axial flow pump 47 is a discharge elbow 49 having a substantially S-shaped cross-section in a horizontal cylindrical suction bell 48. Are provided, the suction port 50 of the suction bell 48 is opened laterally, and the discharge port 51 of the discharge elbow 49 is opened laterally upward. A pump base 52 is disposed on a curved wall 49a on the lower surface side of the discharge elbow 49. A bearing box 7 of the structure shown in FIG. The main shaft 9 projecting from the inside is horizontally arranged. An impeller 10 fixed to the tip of the main shaft 9 is disposed inside the suction bell 48, and a guide blade 53 is disposed on the suction bell 48 on the suction side of the impeller 10. Although not shown, a recess A is formed in the inner peripheral wall of the discharge elbow 49 through which the main shaft 9 is inserted. The drive machine base 14 is connected to the pump base 52, and the drive shaft 16 of the drive machine 15 is connected to the base end portion of the main shaft 9 via the shaft coupling 17. FIG. 8 shows an embodiment of an offset in-line type horizontal axial flow pump installed outside the water storage tank. A horizontal axial flow pump 47 is installed in the horizontal direction in the water storage tank 26, and is arranged in the water storage tank 26. The suction pipe 27 is connected to a suction bell 48 of a horizontal shaft axial flow pump 47 through a suction valve 28. A horizontal discharge pipe 30 is connected to a discharge elbow 49 of the horizontal axial flow pump 47, and the discharge pipe 30 is connected to a drain pipe 32 via a discharge valve 31. In the horizontal axial flow pump 47 installed on the horizontal axis outside the tank, a water suction pipe 27 for extracting sewage from the water storage tank 26 and a drain pipe 32 for discharging the sewage form an offset inline.

  FIG. 9 is a longitudinal sectional view of a slant shaft axial flow pump installed on a slant shaft. The slant shaft axial flow pump 58 is connected to a curved suction bell 59 that opens obliquely upward and laterally. A discharge elbow 60 having a generally letter-shaped cross-sectional view is provided continuously, and the suction port 61 of the suction bell 59 and the discharge port 62 of the discharge elbow 60 are laterally open on the horizontal line. A pump mount 63 inclined obliquely upward is disposed on the curved wall 60a on the upper surface side of the discharge elbow 60, and the bearing box 7 of the structure shown in FIG. The main shaft 9 is discharged and protruded into the elbow 60 so as to be inclined. An impeller 10 fixed to the tip of the main shaft 9 is extended inside the suction bell 59, and a guide blade 64 is disposed on the suction bell 59 on the suction side of the impeller 10. Although not shown, a recess A is formed in the inner peripheral wall of the discharge elbow 60 through which the main shaft 9 is inserted. The inclined drive machine base 14 is connected to the pump base 63, and the drive shaft 16 of the drive machine 15 is connected to the base end portion of the main shaft 9 via the shaft coupling 17.

  FIG. 10 shows an embodiment of an inline-type oblique axial flow pump installed outside the water storage tank. An oblique axial flow pump 58 is installed in the water storage tank 26 and disposed in the water storage tank 26. The suction pipe 27 is connected to a suction bell 59 of an inclined axial flow pump 58 through a suction valve 28. A discharge pipe 30 installed in a horizontal direction is connected to a discharge elbow 60 of the oblique axial flow pump 58, and the discharge pipe 30 is connected to a drain pipe 32 via a discharge valve 31. The oblique axial pump 58 installed obliquely outside the tank forms an in-line in which the water suction pipe 27 for extracting the sewage from the water storage tank 26 and the drain pipe 32 for discharging the sewage are on the horizontal line.

  In the axial flow pump for water treatment according to the present invention, the main parts of the main shaft 9, the bearing box 7, the bearings 18 and 19, and the impeller 10 are combined into one assembly. Since the main shaft 9 is cantilevered and supported by bearings 18 and 19 on the land, and the main shaft 9 is shortened as much as possible, the whole can be made compact. By increasing the distance between the bearings 18 and 19, the deflection of the main shaft 9 is reduced, and by adopting the non-water-injecting mechanical seal 23 as the shaft seal device, water can be stopped regardless of the installation direction of the pump. Since the periphery of the mechanical seal 23 without water injection is wide and easily exposed to water flow in the underwater portion, there is no air accumulation regardless of the installation direction of the pump, and the mechanical seal 23 does not perform dry operation. The vertical axial flow pump 1, the horizontal axial flow pump 33, the horizontal axial flow pump 47, and the oblique axial flow pump 58, which incorporate this main part as a common assembly, are supplied to the discharge elbows 3, 35, Since all parts are arranged in the vicinity of 49 and 60, the installation direction can be freely adapted to various piping layouts. Vertical axis installation, horizontal axis installation, horizontal axis installation (offset inline type), oblique axis installation (inline type), etc. are possible, piping in the corridor is simplified, and maintenance space is secured. This is effective when you want to install a pump in a limited space such as a corridor in a treatment plant.

The axial flow pump for water treatment according to this device is composed of the main components of the main shaft, bearing box, bearing, and impeller, so that it can be installed vertically, horizontally, Axis installation (offset inline type), slant axis installation (inline type), etc. are possible, piping in the corridor is simplified, and maintenance space is secured.
Therefore, a vertical axial pump, a horizontal axial pump, and an oblique axial pump that incorporate a bearing box and an impeller into the main shaft and make the main parts one common assembly perform sewage treatment and advanced treatment. Therefore, it is suitable for an axial flow pump for circulation or transfer.

It is a longitudinal cross-sectional view of the vertical axial flow pump of the axial flow pump for water treatment which concerns on this device. Similarly, it is the principal part longitudinal cross-sectional view which incorporates a bearing box, a bearing, and an impeller in the main shaft, and makes main components into one assembly. Similarly, it is a principal part enlarged view of the vertical axis axial flow pump which hangs down a main axis to a discharge elbow. Similarly, it is the Example of the vertical-axis axial flow pump installed outside the tank of the water storage tank. Similarly, it is a side view of a horizontal axis axial flow pump installed in the horizontal axis. Similarly, it is the Example of the horizontal-axis axial flow pump installed outside the tank of the water storage tank. Similarly, it is a longitudinal sectional view of a horizontal axis axial flow pump installed in the horizontal axis. Similarly, it is the Example of the offset in-line type horizontal-axis axial flow pump installed outside the tank of the water storage tank. Similarly, it is a longitudinal cross-sectional view of the oblique-axis axial flow pump installed in the oblique axis. Similarly, it is an embodiment of an inline-type oblique-axis axial flow pump installed outside the reservoir. This is a conventional vertical shaft axial flow pump installed on the roof.

Explanation of symbols

2, 34, 48, 59 Suction bell 3, 35, 49, 60 Discharge elbow 3a, 35a, 49a, 60a Curved wall 4, 36, 50, 61 Suction port 5, 37, 51, 62 Discharge port 6, 38 , 52, 63 Pump mount 7 Bearing box 8 Flange 9 Main shaft 10 Impeller 15, 40 Drive unit 18, 19 Bearing 22 Draining ring 23 Mechanical seal 23a Boss part 23b Eave part A Recess

Claims (6)

  An impeller (10) that discharges the main shaft (9), passes through the curved walls (3a, 35a, 49a, 60a) of the elbow (3, 35, 49, 60), and is fixed to the tip of the main shaft (9). In an axial flow pump that is arranged on the suction bell (2, 34, 48, 59) and interlocks and connects the drive unit (15, 40) to the base end of the main shaft (9), the upper portion of the main shaft (9) is pivotally supported. A pair of bearings (18, 19) to be arranged in the bearing housing (7) at a predetermined interval, and a disk-shaped draining ring (22) is externally fitted to the main shaft (9) in the vicinity of the bearing housing (7), Mechanical seal (23) formed with a boss portion (23a) to be inserted into the discharge elbow (3, 35, 49, 60) and a flange portion (23b) connected to the curved wall (3a, 35a, 49a, 60a) ) Is extrapolated to the main shaft (9), and the impeller (10) is fixed to the tip of the main shaft (9). Management for axial flow pump.   A pump mount (6, 38, 52, 63) is disposed on a curved wall (3a, 35a, 49a, 60a) on the back side of the discharge elbow (3, 35, 49, 60), and a bearing box (7) Discharge elbow (3, 35, 49, 60) through which the annular flange (8) projecting from the middle part of the pipe is connected to the pump base (6, 38, 52, 63) and the main shaft (9) is inserted The axial flow pump for water treatment according to claim 1, wherein a recess (A) is formed in the inner peripheral wall of the boss, and one end of the boss portion (23a) of the mechanical seal (23) is protruded.   A discharge elbow (3) having a semicircular cross-sectional view is connected to the above-mentioned standing tube-shaped suction bell (2), and the suction port (4) of the suction bell (2) is opened at the lower end for discharge. The discharge port (5) of the elbow (3) is opened to the upper side, and the main shaft (9) penetrating the curved wall (3a) on the upper surface side of the discharge elbow (3) is provided vertically. The axial-flow pump for water treatment according to claim 1 or 2.   A discharge elbow (35) having a semicircular cross-sectional view is connected to the horizontal tubular suction bell (34), and the suction port (36) of the suction bell (34) is opened laterally to discharge the suction bell (34). The discharge port (37) of the elbow (35) is opened upward, and the main shaft (9) passing through the curved wall (35a) on the lower surface side of the discharge elbow (35) is disposed horizontally. The axial-flow pump for water treatment according to claim 1 or 2.   A discharge elbow (49) having a substantially S-shaped cross-section is connected to the horizontal cylindrical suction bell (48), and the suction port (50) of the suction bell (48) is opened sideways. The discharge port (51) of the discharge elbow (49) is opened to the upper side, and the main shaft (9) passing through the curved wall (49a) on the lower surface side of the discharge elbow (49) is arranged horizontally. The axial-flow pump for water treatment according to claim 1 or 2, characterized by being provided.   A discharge elbow (60) having a generally square cross-sectional view opened obliquely downward and laterally is connected to the curved suction bell (59) that opens obliquely upward and laterally. 59) and the discharge port (62) of the discharge elbow (60) are opened laterally on the horizontal line so that the curved wall (60a) on the upper surface side of the discharge elbow (60) passes therethrough. The axial flow pump for water treatment according to claim 1 or 2, wherein the main shaft (9) is inclined.

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