JP2010255616A - Centrifugal pump integrated with motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To save labor for maintenance by adopting a simpler structure for a centrifugal pump, improving rotation stability, saving space, reducing cost, using an annular mechanical seal which does not require adjustment for a long period of time for shaft seal and adopting a simpler method for replacing. <P>SOLUTION: The electric motor is connected with a pump body through flange coupling and a motor shaft is extended without coupling to form a pump shaft. Lateral and vertical shaft centrifugal pump is structured with a shaft seal mechanism arranged in a casing penetration part and an impeller arranged for the extended shaft. A ribbed sleeve is arranged for the shaft seal and the annular mechanical seal is inserted from the shaft end side. The impeller of which attaching and detaching is facilitated with a tapered shaft or a fine stepped shaft is removed and the mechanical seal is replaced by gripping the rib of the sleeve and pulling it at once. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention mainly relates to a centrifugal pump used for seawater / fresh water and lubricating oil as a marine auxiliary machine, and is applicable to general land use.

  In general, a centrifugal pump used for seawater and fresh water is a horizontal shaft machine that is used in a horizontal axis posture. The pump body is assembled with a flange on a bearing frame with a base, and is connected to an electric motor with a flexible joint and mounted on a common base plate. A pump set is configured, and a gland packing is used to seal the shaft (water stopping at the casing penetration of the pump shaft) by winding a string-like oil-impregnated fiber around the shaft and inserting it from the bearing side (on the opposite shaft end side). Further, the extra length necessary for the packing insertion / replacement and packing presser adjustment is added, and the cantilever shaft to the end of the impeller shaft becomes longer. Therefore, the total length of the pump set is increased and a considerable installation space is required.

  The pump set of medium and small diameter (product example of 125mm or less) uses a motor bearing by extending the shaft of the motor with a flange attached to a frame with a common base (hereinafter referred to as a common base) with a rigid joint. There is a pump set whose overall length is shortened by the bearing part of the bearing frame, but the shaft seal has a long cantilevered shaft for insertion and adjustment from the rigid joint side (the opposite end side) as above. .

  The former cantilever shaft is about 1.5 times the bearing span (Bearing Span), and the latter is almost the same as the motor bearing span, and the impeller's own weight at high speed (motor 4 pole machine 1800 rpm, 2 pole machine 3600 rpm) Attention should be paid to the stability against fluid vibration and bearing load.

  In the vertical axis machine used in the vertical axis posture, the motor base frame with the open side is provided on the pump body and the motor is mounted on the flange, so the pump set is more space-saving than the horizontal axis machine with the common base plate. However, the pump shaft is connected to the motor with a flexible joint, and the structure around the shaft such as a ball bearing and carbon bearing on the pump body is complicated, or a long cantilever shaft is rigidly connected to the motor shaft as described above. As with horizontal shaft machines, extra length due to gland packing shaft seals is added, and it is necessary to pay attention to stability at high speed and bearing load.

The vertical axis machine has a flat pump body with suction and discharge ports at both ends, so the dimensions between the surfaces are large, and there is considerable space for installation, including separate valves and operations on the suction and discharge sides. is required.

The shaft seal gland packing is prone to water leakage and increased power loss due to the tightness of the packing retainer, and is subject to wear.Therefore, there are not many customer requests for mechanical seals that can be used without adjustment for a long time. Since it consists of seal parts, the above-described pump shaft structure requires complicated heavy work such as disassembly of the pump body and removal of the electric motor to replace the seal.

In the medium / large diameter vertical axis machine, the suction port / discharge port is moved to one side from the shaft core, and the volute part of the pump body is split vertically to form a volute cover, which is then removed and opened laterally, inspecting / rotating part There are examples of products that can be pulled out horizontally, but they are complicated in shape and structure, such as the motor base frame and support legs, and are expensive due to various processing steps, and the installation space is large due to the addition of a horizontal open space.

  In view of the above-mentioned problems in the background art, the size and size of the pump set can be shortened with a simple and rational configuration, and the mounting and replacement of an annular seal such as a mechanical seal can be facilitated. Cost-saving / space-saving and labor-saving in operation / maintenance.

  [Handling fluid] Pumps handle a wide variety of fluids, including water and oil.

  [Pump configuration] The motor is directly attached to the pump body with a flange, and the motor shaft is extended without contact to form a pump shaft consisting of a draining part, shaft sealing part and impeller part. A shaft sealing mechanism having a structure in which an attached sleeve is provided and an annular seal is inserted from the shaft end side is provided to constitute a spiral pump integrated with an electric motor.

  [Horizontal shaft machine] A main body with a discharge port and a casing cover with a suction port on the shaft end side constitute a pump body, the casing cover is opened, the impeller is removed, and the annular seal at the shaft seal is replaced. A centrifugal pump integrated with an electric motor used mainly in a horizontal axis posture (hereinafter referred to as a horizontal axis machine in addition to special notes) is configured.

  [Prior Invention] In the prior invention “Japanese Patent Application No. 2008-305979” claiming priority, the motor and the pump body are flanged with the common base sandwiched, and the motor shaft is extended with a rigid joint that is arranged in the common base. In a horizontal centrifugal pump with a pump shaft, a mechanical seal is inserted from the shaft end side into the shaft penetrating part of the pump body, and the short pipe arranged between the suction port and the suction valve integrated in the casing cover is removed. The pump opening space is taken, the casing cover and the impeller are sequentially removed, and the shaft seal mechanism and the suction pipe are configured so that the mechanical seal can be replaced.

  [Vertical axis machine] A main body with suction port and discharge port and a casing cover with a shaft seal mechanism on the motor side constitute a pump body, and the motor is flanged to the main casing with the casing cover interposed therebetween. The cover and impeller can be removed from the main casing at once, and the annular seal of the shaft seal can be replaced by removing the impeller. , Called a vertical axis machine).

  [Shaft sealing mechanism] An annular seal is inserted into a flanged sleeve that has been pushed into the shaft penetrating portion of the pump body from the shaft end side, and a shaft sealing mechanism is constructed in which the seal can be pulled out and replaced by grasping the flange of the sleeve. .

  [Bearing protection / leakage check] Water drainage is placed on the shaft between the motor and shaft seal to waterproof the motor bearing, and multiple drains and peep holes are placed on the motor side of the pump body to seal the shaft. It is possible to discharge water leakage from the section and check the water leakage status.

  [Shaft seal liquid] In order to keep the sliding surface (seal ring and carbon ring) of the annular seal always wet and clean, and to prevent the intrusion of air and dust, the shaft seal water (shaft seal liquid) of discharge pressure is given. Through a fine filter of Fine Mesh according to the foreign matter content of pump suction water (suction liquid).

  [Impeller Shaft Portion] The impeller portion of the pump shaft is preferably a tapered shaft or a minute stepped shaft, and a spanner hook is provided at the end of the impeller boss to facilitate attachment / detachment of the impeller.

  [Horizontal axis machine frame] The horizontal axis machine frame (Base) may be placed on either the motor or the pump body, but it is a stationary motor that occupies most of the dimensions (length) and weight of the pump set. It is good to use the leg part of this, and in a large-sized pump, it is good to add an auxiliary frame to a pump main body.

  In view of the motor core height, which is slightly smaller than the radius of the coupling flange with the pump body, an adjustment plate of the difference thickness is arranged under the motor leg so that the faulty motor can be removed laterally beyond the shaft end length on the abutment. Designed so that the center of gravity of the motor rests safely in the top plate of the abutment in position.

  [Improved Invention] In the horizontal shaft machine of the “swirl pump integrated with the electric motor” (hereinafter referred to as the prior invention) in the above-mentioned inventions of the priority claims “Japanese Patent Application Nos. 2008-336306 and 2009-089752,” the pump body The horizontal axis machine of the improved invention is constructed by arranging a suction port on the lower shaft end side, a casing cover concentric with the shaft core and on the shaft end side so that the outer periphery of the suction port flange does not interfere with the outer periphery of the casing cover To do.

  Both the single suction type and the double suction type of the impeller guide the radial flow path of the vertical axis machine to the shaft end side in a right angle elbow shape to constitute the suction port.

  In addition, the suction port position is standard at the lower part of the pump body, and the side of the pump body or under the slant is also possible depending on the installation location of the pump and piping convenience.

The centrifugal pump integrated with the electric motor of the present invention configured as described above has a great effect as described below.

[Pump set dimensions] The pump shaft is mainly composed of a shaft seal and an impeller, and the axial length of the pump body that contains them is about half that of an electric motor. It is shortened, especially for horizontal machines, halving and saving space.

  [Parts saving] Flexible and rigid shaft joints of conventional pump shaft, bearing frame with base and common base plate or common base in horizontal axis machine, motor base frame and carbon bearing in vertical axis machine, etc. Special bearings are no longer needed, and the cost savings are significant.

  [Cantilever shaft shortening] The pump shaft formed by non-joint extension of the motor shaft is about 1.5 to 2 times the motor standard shaft length (JIS standard "Q" dimension), that is, the cantilever length is between the bearing supports in the motor (Bearing It is about 1/2 of the Span) and 1/3 to 1/2 of the pump of the prior art, and the shortening is remarkable, so the load on the load side bearing of the motor against fluid vibration etc. is reduced, and high speed rotation (4-pole motor) High stability can be obtained even at 1800 rpm, 2 pole machine 3600 rpm, or even higher speed of the inverter variable speed), and the design can be extended to large centrifugal pumps.

  [Expansion of capacity range] For example, a seawater pump is loaded in a ballast system that requires a large-diameter machine even if it follows the product example cataloged up to 300 mm in the diameter of a single-shaft impeller horizontal axis machine in a conventional centrifugal pump. Up to several tens of thousands of tons, the cooling system can be sufficiently applied as an auxiliary machine for large ships of the same class. In the improved invention, as with the capacity of the product example of the conventional vertical axis machine, The range of application can be further expanded to super-large ships that use large-bore machines for both ballast and cooling systems.

  [Lubricating oil system] The main engine cooling system lubricating oil pump (single-stage type) has a slightly larger impeller and shaft power than most intermediate-pump water pumps due to the specific gravity and viscosity of lubricating oil. It can be applied with a horizontal machine and can be directly sucked with a pump core (impeller core) sufficiently lower than the liquid level of the sump tank under the engine, or via a check valve installed lower than the liquid level ( Once the pump is primed, it is held by the check valve).

Centrifugal pumps do not have sliding parts for fluid transport by centrifugal force, and generally do not require tooth surface protection like gear pumps used for oils, and are fine for suction from sump tanks filled with oil through a cleaner. The primary strainer of the mesh [Fine Mesh] is not required (supplied to the main engine via the automatic backwashing type secondary strainer on the discharge side), especially the dual-use (regular / preliminary) lubricating oil pump as an important auxiliary machine (1800rpm) ) And small-sized centrifugal pumps are more advantageous in terms of durability, space and cost.

  [Maintenance / Inspection] Since the casing cover with suction port faces sideways in the horizontal axis machine, the pump set, discharge valve, piping and suction valve remain installed, that is, the adjacent machine is in operation and the short pipe in front of the suction port is removed. With the casing cover and impeller having a small depth, in the improved invention, the annular seal can be replaced with a light work by removing only the casing cover. As described above, the impeller shaft portion is replaced with a tapered shaft or a minute stepped shaft. It is easy to remove and install the impeller.

[Suction short pipe] This short pipe has both the hydraulic phenomenon of suction water rotation and the function of the sacrificial pipe accompanying the seawater-based bronze pump body and the dissimilar metal adjoining. For convenience, either a flexible straight pipe, an elbow or a branch pipe can be used and can be removed by releasing the flange connection. In the improved invention, the casing cover can be directly removed and opened while the short pipe is installed.

  [Vertical axis machine] The vertical axis machine is generally applied mainly to large pumps, but in the engine room and pump room, heavy lifting tools and equipment are used, and a motor suspension ring that accounts for the majority of the total weight of the pump set is used. Since it can be lifted together and rolled up together with the casing cover and the impeller, it is possible to remove the impeller and replace the annular seal in the same manner as the horizontal shaft machine.

[Improved invention] In the improved invention, the front of the pump body is a complete space, it is opened by removing the casing cover only in light work, and the impeller can be removed and the annular seal can be replaced more easily. Both suction impellers can also form a horizontal axis machine, and can be applied to large-diameter and large-capacity machines used in super-large ships.

  [Cantilever shaft length] In both suction impellers of the high flow vertical axis machine and the horizontal shaft machine of the improved invention, the shaft length of the impeller part is slightly increased from that of the single suction impeller, and the cantilever shaft becomes longer. The ratio is much smaller than the bearing span of the motor, and the influence on the motor bearing load and stability at high speed rotation is negligible.

[Shaft seal inspection] Mechanical seals with annular parts have high shaft seal performance, durability, and reliability, and can be used without adjustment for a long period of time on a yearly basis through proper operation management. Normally, the pump casing is drained. -Visual inspection of minute water leakage from the inspection hole is sufficient, and it is advantageous for maintenance work labor saving even with the impeller removal work as described above for the annular seal.

  [Internal inspection] The pump is opened by removing the casing cover, and the impeller suction side from the valve operation front can be easily removed with the taper shaft or micro stepped shaft, and the entire pump interior including the shaft seal can be inspected. A complicated structure such as a conventional vertical pump with a half-divided volute is unnecessary.

[Abrasion / Failure] Generally, in a centrifugal pump, the wear is only the shaft seal part with the sliding part, and the interval (Interval) of the annular seal replacement with high performance, durability, and reliability is significantly extended as described above. The inside of the casing that is in contact with the non-contact rotating impeller and the fluid has little wear due to friction with the contained foreign material that has passed through the intake side strainer, etc., so it is sufficient to check when opening the seal replacement, The encapsulated bearing of an electric motor does not require lubrication, and the chance of failure of an electric part (insulation, etc.) is very small.

[Shaft seal seal pull-out] The mechanical seal set used for the shaft seal consists of an annular seal ring, carbon ring, and spring mechanism. In view of the impossibility of extrusion from a narrow space on the motor side, the seal set can be replaced by pulling together with a flanged sleeve on the shaft end side.

[Draining / Draining] In the narrow space between the shaft seal boss of the main casing and the motor flange, the motor bearing is waterproofed from the leakage of the shaft seal by the rotational centrifugal force of the water drain arranged on the motor shaft. It is possible to check the drainage and leakage status with multiple drains and peepholes on the outer periphery.

[Reliability] The centrifugal pump according to the present invention has a simple structure in which no small parts other than the seal set inside the shaft seal portion are present in the casing. There is no trouble that damages related equipment, and reliability is very high.

  [Valve Arrangement] The horizontal axis machine has a small dimension between the horizontal planes between the suction port and the discharge port and a moderately large dimension between the vertical planes. It can be centrally arranged around the valve. Especially, the valves and pipes are arranged vertically in the discharge side. Combined with the remarkable shortening of the total length of the pump set by integrating with the motor, the inter-surface dimensions of suction and discharge in the vertical axis machine Rather than splitting the valves and piping into two parts, the space is saved.

  [Advantages of space utilization] Generally, in the engine room of a ship, as described in the related inventions "Japanese Patent Application No. 2009-089751" and "Japanese Patent Application No. 2009-138942", the difference in height between the double bottom and the passage floor is There are examples of a medium-sized ship of several 5,000 tons class, 800 mm, and a large ship of 80,000 ton class, 1600 mm. If the horizontal axis machine of the spiral pump of the present invention is used for a pump such as a seawater system installed on a double bottom, Valves and piping on the pump set and suction side all fit under the passage floor. Valves and piping on the discharge side are three-dimensionally arranged on the discharge side in ballast and fire / bilge systems. Since related equipment can be arranged and connected to the discharge system of the pump to form a three-dimensional composite unit, it is convenient for effective use of the three-dimensional space of the engine room.

It should be noted that a plurality of horizontal axis machines can be installed in parallel on the middle longitudinal stringer on the ridge side with a small depth, which is advantageous in terms of engine room arrangement together with the above three-dimensional composite unit.

The horizontal axis machine installed under the floor of the passage is used for maintenance such as valve operation front and shaft seal seal replacement on the shaft end side, the discharge valve / pipe is low in the space on the pump, and related items such as a cooler and secondary strainer The opposite end can be used for equipment installation and motor maintenance, and combined with the short size of the pump set, the combined unit can be configured in a space-saving manner.

[Common parts] Both the horizontal axis machine and the vertical axis machine are composed of the same design parts for the motor, its shaft end, shaft seal and impeller. The horizontal axis machine (single suction port) of the improved invention has a common design other than the suction port part of the main casing of the horizontal axis machine (double suction port) of the related invention "Japanese Patent Application 2009-165327" and the casing cover. It is convenient for production management and maintenance.

[Advantages of the improved invention] In the horizontal shaft machine of the improved invention, the difference in height between the suction pipe and valve and the pump core is rather smaller than in the case of using the downward elbow of the previous invention, and the installation height of the pump shaft is kept low. In addition, the space before the casing cover is completely free, and a series of work space from opening / inspecting the pump to replacing / reassembling the shaft seal can be greatly increased.

[Pump frame] The pump frame of the horizontal axis machine may be placed on either the pump body or the motor, but the pipe itself has sufficient structural strength for the large and medium caliber pumps. It may be regarded as a part of the piping, and it is more advantageous for seismic stability and cost saving to use the standard leg (Base) of the motor that occupies most of the size (length) and weight of the pump set. In addition, it is convenient because a piping space can be taken, and a simple auxiliary leg plate of a large-diameter machine of both suction impellers can be used for weight support of valves and pipes directly above the pump.

If the base frame is arranged on the pump body, the heavy motor with the center of gravity of the pump set outside the base frame is cantilevered, and particularly, the seismic stability against engine vibration is impaired. Therefore, it should be limited to a small-diameter pump.

[Common use of standard parts] The motor is a mixture of a stationary stator frame and a flange-type end bracket, but both are standard production parts and shafts except for the end of the non-contact extension shaft. The standard design is designed for both the single suction type and the double suction type pump. The suction port is directed to the shaft end side based on the design of the volute part of the vertical pump casing of the conventional technology. Apart from the cover, the seal parts and impellers are standard design and production parts, and the present invention can be sufficiently realized without any problems in pump technology.

[Pump body machining] In the horizontal axis machine of the previous invention, the coupling flange and suction port of the pump body (main casing and casing cover) are only concentric turning, and the discharge port is single turning (same as the auxiliary leg in the large bore machine) In the horizontal axis machine of the improved invention, the suction port is only subjected to a different center turning process, the vertical axis machine of the previous invention is the same as the discharge port and the concentric turning process, and the casing is all of the concentric turning process. Therefore, the machining process is simple, and the cost saving effect is remarkable in combination with the simple pump configuration described above.

In the twin suction port horizontal axis machine of the above related invention, the pump body is not only concentric turning but also the twin suction port is concentric turning, and the machining process is simple (described for reference).

[Terminal box position] The terminal box of the motor is standard on the left side when viewed from the shaft end, but with 5.5kW4P or more, the stator frame is symmetrical back and forth, and can be easily recombined at the installation site on the right side as required for equipment layout. It is.

[Application Category] The electric motor-integrated centrifugal pump of the present invention is portable and stationary as a low-debt, low-priced general-purpose pump using the single suction horizontal shaft of the axial suction port of the previous invention for both land and sea. (B) The vertical suction machine of the prior invention is the vertical axis of the prior art. The double suction port horizontal axis machine of the related invention described above can be used for replenishment of a mold machine, and can be used for a pouring / drainage system (bidirectional flow system) or a different system combined system.

For ships, (B) the lower suction port horizontal shaft machine is used for each system of seawater, fresh water, and lubricating oil in the engine cooling system, and (A) the small shaft suction port horizontal shaft machine is used for various facilities such as air conditioning and miscellaneous systems. In addition, it is recommended that the dual suction port horizontal shaft machine of the separate invention be used for bilge and ballast pipe devices.

[Self-suction function] Although the centrifugal pump does not have a self-priming function in the anhydrous state, it can hold the priming water effectively by inserting a check valve into the intake pipe below the surface of the water. Can be self-sucked and supplied as soon as it is fully charged (however, dry running during long periods of stoppage or open inspection (Dry Running), especially when the mechanical seal is dry) Note).

In a ship, as shown in the related invention “Japanese Patent Application No. 2009-227263”, the seawater system pump installed on the double bottom is always under the draft line even in an empty load, for example, emergency suction / drainage attached to the engine cooling device. , The standby side of the redundant pump unit is always filled (primed) up to the valve body of the emergency suction check valve together with the normal machine in operation, and the spare machine is switched to the emergency suction / discharge valve. The vacuum pump attached to the conventional pump is not indispensable because it can immediately self-suck and drain once it is started.

Side sectional view showing the entire horizontal shaft of the centrifugal pump according to the present invention Side sectional view showing the main part of the horizontal axis machine of the centrifugal pump of the prior invention Side sectional view showing the procedure for inserting and replacing the shaft sealing mechanism, draining mechanism and annular seal (mechanical seal) of the centrifugal pump of the previous invention In the embodiment of the horizontal shaft machine with a pump frame and the piping of the spiral pump of the previous invention, (a) is an overall side view, and (b) is a diagram of a flexible straight pipe. In the embodiment of the horizontal shaft machine with motor base frame and piping of the spiral pump of the prior invention, (a) an overall side view, (b) shows a figure of a flexible straight pipe. Side sectional view showing the whole vertical axis machine of the centrifugal pump of the prior invention Side sectional view showing the main part of the vertical axis machine of the centrifugal pump of the prior invention Side sectional view showing the open lifting portion accompanying the replacement of the annular seal of the vertical axis machine of the centrifugal pump of the previous invention As another proposal of the impeller shaft portion of the centrifugal pump of the present invention, (a) shows a tapered shaft and (b) shows a minute stepped shaft. Side sectional view showing whole of single suction type horizontal shaft machine of centrifugal pump of improved invention Side sectional view showing the whole of the double suction type horizontal shaft machine of the centrifugal pump of the improved invention The related main equipment around the spiral pump of the improved invention is shown, (a) is a side view, (b) is a front view.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention (prior invention) will be described with reference to the drawings by way of examples, and the handling fluid (water, oil, etc.) will be representatively described with water in addition to special notes.

  FIG. 1 shows an overall view of a horizontal shaft machine according to an embodiment of the present invention, and FIG. 2 shows the main part of the pump. A pump body 1 and an electric motor 2 are flanged by a main casing 3, a flange 5 of an end bracket 4 and a bolt 6. However, it mainly forms a centrifugal pump integrated with a motor using a horizontal axis.

  [Horizontal axis machine configuration] The main casing 3 and the casing cover 8 are manufactured integrally with the discharge port 7 and the suction port 9, respectively, and are connected to the main casing 3 with bolts 10 (the O-ring of the connecting portion is not shown).

  The motor shaft 11 is designed with a contactless extension to form a pump shaft having a draining portion 11, a shaft sealing portion 12, an impeller portion 13 and a key 14, and a screw shaft end 17 of a fixing nut 16 of the impeller 15. In addition, a liner ring 18 is provided on each of the casing covers 8 to provide a non-contact sealing function with the impeller 15 through a minute gap (about 0.1 mm) from the impeller 15 side.

In FIG. 1, the motor shaft 11 is supported by a bearing Sm by bearings 33 and 34, and receives a load such as the weight of the impeller 15 and fluid vibration by the cantilever length Sp of the pump shaft portion to the load side bearing 33 (Sp + Sm) / Although the load of Sp is exerted, the operation is remarkably stable even at high speed rotation because of Sp / Sm = 1/2, which is remarkably smaller than the conventional pump. In addition, the water hammer (cavity) It is also strong against abnormal phenomena such as Cavitation.

  [Shaft Sealing Mechanism] If the shaft sealing mechanism is shown in FIG. 3, a flanged sleeve 20 is inserted into the shaft sealing portion boss 19 of the main casing 3 with a snap fit as shown in FIG. Stop water.

  As shown in FIG. 3B, a mechanical seal set 22 including an annular seal ring 23, an O-ring 24, and a carbon ring 25 (including a spring and a spring receiving bracket: detailed illustration is omitted) is provided in the flanged sleeve 20. Insert.

  The carbon ring 25 is attached to the shaft 12 by a snap fit or with an inner peripheral water stop by an O-ring (not shown).

  A key 14 is attached to the impeller shaft 13 and the impeller 15 is pushed in with a nut 16 and attached, and the carbon ring 25 is pushed in completely as shown in FIG.

  [Shaft seal pressure water] As shown in FIG. 1, positive pressure is always applied to the contact sliding portion between the seal ring 23 and the carbon ring 25 of the mechanical seal set 22 to prevent air and foreign matter from entering from the outside and to keep it moist. Pressure water for shaft sealing is supplied from the discharge port 7 through the shaft sealing water pipe 26.

  The shaft seal pressure water is provided with a small mesh small filter 27 depending on the state of inclusion of foreign matter (such as wear metal powder in the case of lubricating oil) such as seawater sand, and the sliding surface of the seal set 22 (23 And the contact surface of 25).

  [Replacement of shaft seal] The mechanical seal set 22 (especially the carbon ring 25) is worn and the contact surface pressure (23 and 25) decreases or the sliding surface is damaged due to a long-time pump operation. When necessary, as shown in FIG. 3D, the special tool 28 is hung on the collar of the sleeve 20 and the shaft end 17 is pushed with the bolt 29 to pull out the mechanical seal set 22 at once.

  This is because the clearance between the inner and outer periphery of the seal ring 23 and the carbon ring 25 is very small and there is also an O-ring adhering, so it is difficult to remove individually and it is impossible to push out from the narrow space between the shaft seal 12 and the motor 1. The scissors are also drawn together by the sleeve 20 like a cartridge (Cartridge).

  After cleaning the shaft seal boss 19 and the shaft 12 and the flanged sleeve 20, the sleeve 20 is inserted into the boss 19 together with the O-ring 21, and the new procedure is performed according to the above-described procedure shown in FIGS. The mechanical seal set 22 is inserted.

  [Prior Invention] The shaft seal mechanism of the horizontal centrifugal pump having the rigid extension shaft of the prior invention “Japanese Patent Application No. 2008-305979” and the pump configuration relating to the pump opening / shaft seal replacement are self-evident in the “Summary of the Invention”. The illustration is omitted.

  [Pump frame] The horizontal axis machine is a flange-type electric motor that is a standard production except for the shaft 11 as long as an integrally-cast frame 43 is arranged in the main casing 3 as shown by a solid hatched hatching in FIG. 2 and the terminal box 35 can be changed to either the left or right by reversing the flange assembly phase with the pump body 1 even on the ship's site (the suspension ring 36 can be replaced with the screw hole 37) and the motor 2 The space of the related piping can be taken below, or if the leg plate 44 of the stationary stator frame 32 of the standard production part of the electric motor 2 is used as indicated by the phantom line of the chain line (the adjustment plate 44t will be described later). Because the motor 2 with the most weight of the pump set is installed, the pump body 1 is stable and light and cost-saving. For motors of JIS standard frame number 132S (5.5kW4P) or higher, the stator frame 32 that is symmetrical in the front-rear direction is used. Flip horizontally to either left or right of terminal box 35 Can also be changed, the phase of the pump body 1 can be shifted 90 degrees for convenience of the discharge side piping, and the discharge port 7 can be turned sideways, and the space of the related piping can also be taken under the pump body 1 for layout design and construction management. Convenient.

  [Valve Arrangement] As shown in FIG. 1, since the horizontal axis machine has a small horizontal plane dimension Lh and a moderate vertical plane dimension Lv, as shown in FIG. 4 and FIG. 7 valves 38 and 39 can be centrally arranged, and the valve can be operated at one place on the pump side, and suction and discharge by the inter-plane dimension Lf (= almost twice Lv) of the vertical axis machine shown in FIG. Compared with the split arrangement of valves (not shown for self-explanation), combined with the motor and the integrated type, the horizontal installation is more advantageous for the horizontal axis machine, and it has a shelf-like structure such as a middle longitudinal stringer. It is also possible to install the device in a convenient manner.

  [Suction short pipe] The depth of the casing cover 8 is short, and as shown in FIG. 4A, the casing cover 8 is opened and the impeller 15 is removed by removing the short pipe 40 (rough shaded portion) in front of the suction port. A space for replacing the mechanical seal set 22 is easily obtained.

The suction port 9 is close to the impeller 15, and in view of the hydraulic phenomenon of the rotation of suction water and the sacrificial pipe function adjacent to the bronze pump body 1 in the seawater system, the suction valve 38 such as a butterfly valve passes through the short pipe 40. Is normal.

  If the elbow 40 is used, the short tube 40 of the suction port 9 can be easily attached and detached without being restricted by adjacent valves and piping, and can save piping space, and the circumstances of replacing the seal including the surrounding conditions can be reduced. The elbow direction can be selected from upper, lower and side bends. In addition, with a small-diameter pump, the lightweight casing cover 8 and the elbow 40 can be removed and attached together.

When the short pipe 40 is a straight pipe, if a flexible pipe (hose 49, tightening band) as shown in FIGS. 4 (b) and 5 (b) is used, flange connection by adjacent valves / piping is possible. It can be easily operated avoiding restraints, and there is no trouble such as water leakage under low pressure on the suction side (such as a water line).

As shown in FIG. 4 (a), the pump body 1 with the frame 43 arranged on the main casing 3 is installed on the abutment 45, and the leg plate 44 of the stationary stator frame 32 of the electric motor is used as shown in FIG. 5 (a). In each case, the shaft center height of the electric motor is generally lower than that of the pump body, so that the latter can take a lower pump set core height Hp. It can be used for lubricating oil pumps that require suction (via check valve) and can be equipped with front-operated valves in the piping under the pump body, which is convenient for use in cooling and bilge-ballast seawater pumps. is there.

When the horizontal axis machine is installed on the double bottom 47, as shown in FIG. 4 (a) and FIG. 5 (a), the pump set and the suction side valves and piping all fit under the passage floor 48. In addition, since the annular seal can be replaced on the suction side of the pump body 1, it is possible to install related devices such as a cooler (not shown) on the passage floor 48, which is advantageous in terms of arrangement of the engine room and space utilization.

  [Vertical Machine Configuration] FIG. 6 and FIG. 7 show the overall configuration and the main part of the pump set for the vertical machine of the embodiment of the present invention (prior invention). The left and right suction ports 9 and discharge ports 7 are integrally manufactured, and the casing bracket 8 is sandwiched between the end bracket 4 of the electric motor 2, the flange 5 and the bolt 6. Constitute.

  The casing cover 8 is fixed to the flange 5 of the motor end bracket 4 with a bolt 10 different from the bolt 6 in advance, and then the end bracket 4 and the main casing 3 are flange-coupled.

  A pump shaft mainly composed of a shaft sealing portion 12 and an impeller portion 13 and a liner ring 18 at a facing portion of the impeller 15, the main casing 3, and the casing cover 8 by the non-contact extension design of the electric motor shaft 11 are described in the first embodiment. It is exactly the same as that of the horizontal axis machine.

  [Shaft Sealing Mechanism] The shaft sealing mechanism of the mechanical seal set 22 of the shaft sealing portion 12 is exactly the same as that of the horizontal shaft machine of the first embodiment, with a configuration in which it is loaded and replaced with the flanged sleeve 20 shown in FIG. .

When replacing the seal set 22 which will be described later, the seal set can be pulled out from the shaft of the shaft seal portion 12 while removing the casing cover 8 after the impeller 15 is removed. Since it is quite difficult to pull out the casing cover 8 having a heavy weight, it is easier and safer to pull it out with the flanged sleeve 20.

[Draining / leakage check] In the space between the electric motor 2 and the casing cover 8, the drainage rod 30 and the drainage / inspection hole 31 are provided in the shaft 11 and the casing cover 8 in the same manner as in the horizontal axis machine of the first embodiment. However, in view of the vertical axis posture, the water leakage groove 42 is arranged in the casing cover 8 to guide the water leakage from the shaft seal portion to the water drain / peep hole 31 so that the water leakage state can be checked so as not to stay.

  [Opening of the pump] When opening the vertical axis machine, the flange connection (flange 5 and bolt 6) between the electric motor 2 and the main casing 3 is released, and the main casing 3 is shown in FIG. The suspension cover 36 and the casing cover 8 and the impeller 15 are collectively lifted with a suspension ring and a lifting tool installed in the engine room or pump chamber ceiling structure, and are rolled over in the air to be sideways at the shaft end. The mechanical seal set 22 can be easily replaced in the same manner as the horizontal axis machine (generally, the vertical axis machine is applied to a large pump and becomes a heavy product and has a large space above it, so that lifting equipment and tools are not used. Easy).

[Impeller Shaft Part] In both the horizontal axis machine of Example 1 and the vertical axis machine of Example 2, the impeller part 13 has a tapered shaft as shown in FIG. 9A or a minute step as shown in FIG. 9B. Designed for shaft (basic shaft diameter part 53: do, stepped shaft diameter part 54: d1> do, each with a non-stick fit length of 0.3L, intermediate clearance 55: 0.4L, fit push-in / draw-out length is 0.3L) In addition, if the spanner hook 51 is machined on the boss end of the impeller 15, the impeller 15 is attached / removed immediately by loosening the shaft end nut on the tapered shaft, and 30% of the boss length on the micro stepped shaft. It becomes easy to push in, and a series of operations for replacing the annular mechanical seal set 22 in the space in front of the horizontal shaft machine is further facilitated (the taper shaft becomes a medium suction / small diameter machine for a single suction type impeller. The micro stepped shaft can be applied to large-diameter machines of both suction type impellers).

  [Configuration of Improved Invention] FIG. 10 shows a main part of a horizontal shaft machine of the present invention (improved invention). As a first embodiment, a shaft is provided on the shaft end side of the pump body 1 of the horizontal shaft machine shown in FIGS. A concentric casing cover 8 is provided with a suction port 9 facing the shaft end side at the bottom, and is guided to the suction port in the axial direction by an elbow-shaped channel 9L.

  As for the position of the suction port 9, the mutual center distance is taken so that the outer periphery of the flange does not interfere with the outer periphery of the casing cover 8, and the flow path shape of the pump body 1 follows the conventional vertical spiral pump. FIG. 10 shows a single suction type horizontal axis machine, and FIG. 11 shows a double suction type horizontal axis machine.

  [Single-Suction Type] In FIG. 10, the structure from the single suction-type impeller 15 and the surrounding volute portions 3 v and 8 v of the pump body 1 to the discharge port 7 is shown in FIGS. 6 and 7 of the second embodiment. The main casing 3 is directly flange-coupled to the flange 5 of the end bracket 4 of the electric motor 2 in the same manner as in FIGS. 1 and 2 of the first embodiment, and the suction port 9 is a suction flow formed by the main casing 3 and the casing cover 8. A path is formed in the axial direction by an elbow-shaped channel 9L.

  [Both Suction Type] In FIG. 11, there are flow paths from the volute portions 3 v and 8 v related to the front and rear suction ports 15 f and 15 r of the double suction type impeller 15 to the discharge port 7, and the suction port 7 includes the impeller 15. A suction flow path formed by the main casing 3 and the casing cover 8 from both suction ports 15f and 15r is formed in the axial direction by an elbow-shaped flow path 9L.

  The shaft seal part is the same as that of the first embodiment shown in FIGS. 1, 2 and 3 in both the single suction type and the double suction type. In the double suction type, the gap between the boss end of the impeller 15 and the shaft seal set 22 is used. To the sleeve 22s.

  [Base frame] Since the lower edge 5f of the flange 5 (diameter is LC dimension of JIS standard) of the end bracket 4 is lower than the core height (JIS C dimension of the motor 2), the height difference (t = LC / 2−). C) A thicker adjustment plate 44L is arranged between the leg plate 44 and the abutment 46, and the abutment plate 46P is extended to the tail end side of the motor 2, so that the center of gravity 2G of the motor 2 is stabilized on the abutment plate 46P. Thus, the shaft end length Ls or more can be pulled horizontally and carried out together with a small lifting, and can be removed and repaired after being repaired (this also applies to the first embodiment).

  Other than the above, it is the same as the horizontal axis machine of the first embodiment.

  [Installation form] FIG. 12 shows an example of parallel installation of the horizontal axis machines P1 and P2 of the improved invention. In the side view (a) and the front view (b), the motor 2 installed on the abutment 46 is flange-coupled. The short pipe 40 and the suction valve 38 are arranged at the suction port 9 arranged at the lower part of the pump body 1 and connected to the suction main pipe 56, and the valve 39 is arranged at the discharge port 7 at the upper part of the pump body 1 and connected to the discharge main pipe 41. To do.

  In the case of constituting a composite unit, the discharge valve 39 is formed by combining the non-handle type check valve 39C and the butterfly valve 39B, and the height of the supporting frame 58 of related equipment such as the cooler 57 mounted on the upper part is suppressed. In the case of a shelf-mounted unit, a check valve 39D with a handle (shown by a dotted line) is provided and connected to the discharge main pipe 41.

  When the common machine P1 and the spare machine P2 are installed in parallel as the redundant auxiliary machine, both the suction valves 38 and the discharge valve 39B are opened in both the machines P1 and P2, and the check valve of the standby machine P2 waiting at the discharge pressure of the regular machine P1 is operated. The valve body of 39C is closed to prevent the backflow to the spare machine P2, and the cooling water is supplied to the cooler 57 on the support frame 58 through the discharge main pipe 41.

  The branch pipe 41 </ b> B of the discharge main pipe 41 can also be piped in a space below the pump body 1, and a valve (not shown) can be added to the same operation front as the suction valve 38 and the discharge valve 39.

  The casing cover 8 arranged concentrically on the shaft end side of the pump body 1 can be opened singly, and the space before the casing cover becomes completely free, and the sleeve 20 with the hook including the removal of the impeller 15 and the shaft seal set 22 is incorporated. Gives enough space to pull out and replace.

  The above operation can be carried out by descending from the engine room passage floor 48 shown in FIG. 12A to the operation floor 48L in front of the pump body 1, and in front of the pump body 1, a bilge pipe and a fuel oil pipe parallel to the suction main pipe 56. Piping space such as (not shown) is used, and the width of the operation floor 48L is sufficiently wide.

  As shown in FIG. 12 (a), the suction valve 38 and the discharge valve 39B are lever-shaped and easy to operate, and the opening / closing position is clear and desirable. If the handling fluid is fresh water / lubricating oil, the short pipe 40 is not provided and the suction valve 9 is directly provided. A suction valve 38 may be provided.

DESCRIPTION OF SYMBOLS 1 Pump part, pump main body 2 Electric motor, motor part 2G Electric motor center-of-gravity 3 Main casing 4 Motor end bracket 3v, 8v Volute part 9L Elbow-shaped suction flow path 5 Flange 6 Bolt 7 Discharge port 8 Casing cover 9 Suction port 10 Bolt 11 Electric motor Shaft, draining portion of pump shaft 12 Sealing portion of pump shaft 13 Impeller portion of pump shaft 14 Key 15 Impeller 16 Nut, shaft end presser 15f, 15r Impeller front / rear suction port 15e Impeller outer periphery 17 shaft End, Shaft end thread, Presser bolt 18 Liner ring 19 Shaft seal boss, Shaft penetrating part 20 Barbed sleeve, sleeve 21 O-ring 22 Mechanical seal set 22s Sleeve 23 Seal ring 24 O-ring 25 Carbon ring 26 Shaft seal water pipe 27 Filter 28 Special tool 29 Push bolt 30 Drainer 31 Drain , Inspection hole 32 Motor stator frame 33 Motor bearing 34 Motor bearing 35 Motor terminal box 36 Motor suspension ring 37 Screw hole for suspension ring 38 Suction valve 38H Suction valve handle 39 Angle valve, angle check valve 40 Short tube / elbow 39C Non-handle check valve 39B Discharge valve, butterfly valve 39D Check valve with handle 39H Discharge valve handle 41 Piping 42 Leakage groove 43 Base frame 44 Base frame / leg plate 44L Adjustment plate 46P Abutment plate 45 Abutment 46 Abutment 47 Double Bottom, deck 48 Passage floor 48L Operation floor 49 Flexible hose 50 Hose fastening band 51 Spanner hook 52 Toothed washer 53 Basic shaft diameter part 54 Stepped shaft diameter part 55 Spacing part 56 Suction main pipe 57 Cooler 58 Support frame Lh Horizontal surface Between dimensions Lv Vertical face pipe dimensions Lf Vertical axis face-to-face dimensions Sm Bearing span Sp Cantilever length Hp Pump core height do Basic shaft diameter d Axial length Ls shaft end length of the stepped shaft diameter L impeller portion, crosscut distance P1 conventional machine P2 spare machine D diameter

Claims (6)

  The motor was directly flanged to the pump body, and the motor shaft was extended without contact to form a pump shaft consisting of a drainer, shaft seal and impeller, and pushed into the shaft penetration of the pump body from the shaft end side. A centrifugal pump integrated with an electric motor, which is constructed by arranging a shaft sealing mechanism having a structure in which an annular seal is inserted into a flanged sleeve.   A casing cover with a suction port is arranged on the shaft end side of the main casing, and the casing cover is opened together with the suction short tube to remove the impeller, so that the annular seal of the shaft seal can be replaced. The centrifugal pump according to claim 1 used in the above.   A casing cover with a shaft seal is placed on the motor side of the main casing, the motor is flanged to the main casing with the casing cover in between, the motor, the casing cover and the impeller are removed from the main casing in a lump, and the impeller The centrifugal pump according to claim 1, which is used mainly in a vertical axis posture, wherein the annular seal of the shaft seal portion is configured to be removable by being removed. A casing cover concentric with the shaft core is disposed on the shaft end side of the pump body, the radial suction passage in the pump body is guided to the suction port in the shaft end direction in an elbow shape, and the outer periphery of the suction port flange is the casing The center axis between the suction port and the shaft core so as not to interfere with the outer periphery of the cover, the casing cover is opened, the impeller is removed, and the annular seal of the shaft seal is configured to be replaceable. The centrifugal pump according to claim 1 used in the above.   2. The centrifugal pump according to claim 1, wherein an annular seal is inserted into the shaft penetrating portion of the pump body from the shaft end side to insert an annular seal, and the seal can be pulled out and replaced by grasping the flange of the sleeve. Shaft seal mechanism. A water drainer is arranged on the shaft between the electric motor and the shaft seal, and a plurality of drains and peep holes are arranged on the motor side of the pump body, respectively, to discharge water leakage from the shaft sealing mechanism of claim 5 and The centrifugal pump according to claim 1 configured to be inspectable.