JPS5885398A - Spiral pump - Google Patents

Abstract

PURPOSE:To enhance the performance of a pump by furnishing a deflection wall around a pump runner and thereby smoothing the outflow of the water from the outlet of pump runner. CONSTITUTION:The water discharged to a volute chamber 6 is changed with its direction while situated in this chamber 6, where part of this water will flow out toward the neighborhood of the inlet of volute chamber 6 along the internal walls of the chamber 6 with a flux of flow l. This flux of flow l is changed with its direction so as to flow along the surface of a deflection wall 11 in succession from the internal wall of the volute chamber 6 and, in the form of a flux of flow m, sent off toward the discharge outlet 5 of the pump runner 1. Accordingly the flux of flow L will never intersect with the flux of flow l on the way of return along the internal wall of the volute chamber 6 directly face to face, so that the pumping efficiency is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a centrifugal pump with an improved toe structure for improving pump performance.

Figures 1 and 2 show an example of a very common centrifugal pump.
Reference numeral 3 designates the front shroud 4 of the bomb planner 1, and a casting casing 69 in which the discharge port 5 is housed, and a volute chamber 6t is formed around the bomb planner 1. In order to assemble the pump casing 3, the rear shroud 711t of the pump casing 1 is opened and an opening 8 is provided. Reference numeral 09 is a cast casing cover that closes the opening 8t of the pump casing 3.

Now, in order to improve the pump performance of this engineered centrifugal pump, it is necessary to devise the shape of the bone planner 1 and the casing 3. For example, in a centrifugal pump having the structure shown in FIG. 1, the width W near the inlet of the volute chamber 6
is larger than the width of the outlet 5 of the volute chamber 1, as shown in FIG. It was thought that the flow t returning from the outlet 51I of the Bon planner 1 to the suction port IQll of the Bon planner 1 would deteriorate pump performance. Therefore, in order to prevent this return flow t, the width W near the inlet of the porlute chamber 6 is made closer to the width of the outlet 5 of the bon planner 1, as shown in Fig. 2, to increase the flow path resistance in this part. It is conceivable that this will happen. However, even with this shape, pump performance could not be improved.

The cause of this is that the width W near the inlet of the volute chamber 6 is narrowed, so that the flux t that returns to the outlet 5 of the volute chamber 6 along the inner wall of the volute chamber 6 near the outlet 5 of the volute chamber 1 is reduced by the amount of the volute 5 υ There are many velocity components that oppose the discharge flow of Bon Planner 1, and this flux t can be considered to be obstructing the outflow of the discharge flow of Bon Planner 5. Alternatively, the gap between the rear shroud 7 and the inner wall of the casing 3 or casing cover 9 facing these can be reduced to reduce the return flow t returning from the outlet 5 of the bomb planner 1 to the inlet 10 side. However, if this structure is constructed, the return flow tt - the force that can be reduced I can't go. Friend, since the Bonn Planner 1 slides in the axial direction according to the operation of the pump, in this structure the front shroud 4' of the Bonn Planner 1! It becomes very difficult to manage the gap between the rear shroud 7 and the inner wall of the sink 3 or casing cover 9, and in the worst case, there is a risk that the bomb planner 1 will hit the inner wall of the casing 3 or casing cover 9. quarrel.

As described above, various pump structures have been proposed in the past, but some require new losses due to changing the pump structure, and others require processing or assembly of various parts. It's making it very difficult.

Therefore, the present invention provides a centrifugal pump with a new structure that allows the pump performance to be improved through simple improvements.

As a result of repeating various t-p prototype experiments, the inventors of the present invention found that the reason for the deterioration of pump performance is that part of the flux discharged from one outlet of the bon planner flows along the inner wall of the porlute chamber. When returning to the outlet side, this return flow has a velocity component that opposes the flux discharged by the Bonn Planner and is thought to be obstructing the flux discharged by the Bonn Planner.C Therefore, in order to prevent the flux returning along the inner wall of the volute chamber toward the outlet side of the bomb runner from interfering with the flux discharged from the pump runner, the present invention aims to direct this returning flux to the outlet flow from the bomb runner. A deflection wall is provided near the entrance of the volute chamber so that no velocity component occurs.

Hereinafter, one embodiment of the present invention shown in FIG. 5 will be explained.
In addition, Figure 6 is #! 5 is an enlarged view of the main part. In other words, 11 is a deflection wall extending from the inner wall near the inlet of the volute chamber 6 of the casing 3 to the outlet side of the bomb planner 1. This deflection wall 11 protrudes in an annular manner to the vicinity of the discharge side end face 12 of the front shroud 4 and rear shroud 7 of the bomb planner 1. In other words, the surface 11a of the deflection wall 11 of the bomb planner 111 is the front surface of the bomb planner 1. The discharge screen 12 of each of the shracto 4 and rear shracto 7 extends to the discharge port 51I of the bomb planner 1 with a slight gap.0 Also, the surface 11b of the polysheet chamber 61iil of the deflection wall 11 is the discharge port of the bomb planner 1. This surface 11b extends toward the mouth 5@ in a direction substantially perpendicular to the direction of flow of the flux discharged by the bomb planner 1z. That is, in the case of a centrifugal pump, since the direction of the flux discharged from the discharge hole 5 of the cylinder 1 runner 1 is approximately perpendicular to the rotation axis 2 of the cylinder runner 1, the surface of the deflection wall 11 on the polysheet chamber 6 side 11b is a cylindrical surface centered on the rotation axis 21 and substantially parallel to the rotation axis 2.

With this construction, when the spiral bong starts operating, the water sucked into the hard inlet hole 10 of the bong planner 1 is discharged into the discharge hole 5 and the eshvolute chamber 6 of the bong planner 1. The friendly water is discharged into the poly sheet chamber 6 and its direction is changed within the poly sheet chamber 6, and some of the water is
The flux t that flows out along the inner wall of the polyseat chamber 6 toward the vicinity of the entrance of the polyseat chamber 6 becomes 0. The direction IP is changed along the surface 111), and the flux m is sent out toward the outlet 59A of the bomb planner 1. This flux m crosses the surface 11b of the deflection wall 11 [along the surface 11b] at almost a right angle to the flux discharged from the discharge hole 5 of the bomb planner 1, and then the flux discharged from the discharge hole 5 of the bomb planner 1 becomes the flux. Since it is absolutely larger than m, it is sent out into the poly sheeting chamber 6 again along with this flux.At this time, the flux m is the velocity component (n direction in the figure) that opposes the discharge direction of the flux. Because I don't have skin,
Flowing vomit 1! It doesn't interfere with ft. Therefore, the flux discharged from the discharge port 5 of the bomb planner 1 and the flux t returning along the inner wall of the polysheet chamber 6 do not intersect directly from the front, thereby eliminating the occurrence of vortex loss.

In the spiral bong configured in this manner, the flux t returning along the inner wall of the polyseat chamber 6 does not obstruct the outflow of the flux discharged through the bonder liner. In addition, the gap between the surface 118a of the deflection wall 11 and the discharge side end surface 12 of the pump liner 1 is made small to reduce the flow path resistance at the grooved portion and limit the circulating flow 0 returning to the suction port 10 side of the pump liner 1. Then, the disk friction loss of the pump liner 1 can be reduced. Furthermore, since the deflection wall 11 extends approximately parallel to the rotating shaft 2 on the outside of the discharge side end surface 12 of the Bonn Planner 1, even if the Bonglaloy runner 1 moves in the direction of the opposite axis during its operation, the deflection wall 11 is The same effect can be maintained regardless of movement. Specifically, each loss (vortex loss.

Disc friction loss, etc.) is reduced, which increases the discharge pressure and flow rate of the centrifugal pump, reduces shaft power, and improves pump efficiency.

Next, the embodiment shown in FIG. 7 will be described in detail. In this embodiment, a deflection wall that deflects the flux returning to the discharge port of the pump liner along the inner wall of the polysheet chamber from the casing cover so that a velocity component opposite to the flux discharged from the pump liner is not generated. It is best to extend it towards the mouth.

To explain this in detail, reference numeral 13 denotes a deflection wall extending to the outlet 511 of the casing cover 9 and the bomb planner 1, and this deflection wall 13 is similar to the deflection wall 11 already explained, and is attached to the rear shroud 7 of the bomb planner 1. Arrange in a ring shape with a slight gap from the discharge side end face. In addition, the surface of the polysheet chamber 61Ill of the deflection wall 11 is connected to the casing 3.
The flux m that is connected to the inner surface of the polyseat chamber 6 and returns to the outlet port sm of the bomb planner 1 along the inner wall of the polyseat chamber 6 is created so that a velocity component that opposes the flux that is discharged does not occur. This extension surface is constructed so that it is almost perpendicular to the direction of flow of the flux discharged from the pump runner. When provided on the fi-casing cover 91H, the width wQ of the casing 3 near the entrance of the polystyrene chamber 6 can be increased when looking only at the casing 3. When the casing 3 is made of cast metal, it is necessary to make the width W near the entrance of the volute chamber 6 as wide as possible from the surface of sand removal after casting. Productivity improves. That is, since sand removal after casting of the casing 3 is improved, it is possible to prevent the casting surface inside the volute chamber 6 from becoming rough, and this also contributes to improving pump performance.

In addition, in a centrifugal pump having such a structure, the positional relationship between the outlet 5 of the bomb planner 1 and the deflection walls 11 and 13 is an important issue, but the valley members are processed and assembled as follows. This can be solved by engineering. After the end face 110 of the deflecting wall 11 of the cast casing 3 is machined, the 6-ring surface 3a of the casing 3 is machined using this face 11Q as a reference. Next, the spigot surface 9a of the casing cover 9 and the end surface 1 of the deflection wall 15
3af processing.

By processing in this manner, each member can be finished to have a predetermined dimensional relationship.Furthermore, during assembly, after confirming the relationship between the casing cover 9 and the bomb planner 1,
Assemble the casing 3 to the casing cover 9. This method allows quality control of centrifugal pumps to be carried out in a simple manner. Furthermore, by adopting this unique structure, even when incorporating a bomb planner 1 with a different width of the outlet port 5, it is possible to accommodate 8#J by simply changing the machining dimensions of the gauging cover 9, promoting the common use of parts. be able to.

Next, the embodiment shown in FIGS. 8 and 9 will be described in detail. A circular tubular deflection wall is installed near the entrance of the porlute chamber to prevent the occurrence of turbulence. First, the embodiment shown in FIG. 8 will be explained. This is a companion device in which the bomb planner 1 is constructed and covered by the casing 5 that supports the volute chamber 6t, the casing cover 16 that closes the front shroud 411ilI11i, and the casing cover 9 that closes the rear shroud 7III1'i. 14.1
Reference numerals 5 and 5 designate secondary deflection walls each having a circular tube shape, with a wall thickness of 51 mm.
As shown in the figure, the deflection wall 14 consisting of the casing 3 and the casing cover 16 is sandwiched and fixed to the casing 3 and the casing cover 16, as shown in the figure.
is the thick part 15at of this - sandwiched and fixed by the casing 3 and the casing cover 9 0 In the same manner as in the embodiment already described, the thin part IA'b of the deflection 111Ae15
, 151) are to be arranged on the discharge side end face of the bomb planner 1 when the centrifugal pump is assembled.Of course, this thin part 14t+, 151
) The surface of the volume Y chamber 6@ is connected to the inner wall of the casing 5, and is configured to intersect almost at right angles to the flux discharged from the bomb planner 1. In other words, in a normal centrifugal pump, the Since the water discharge direction is almost perpendicular to the rotation axis 2, the deflection wall 1
4.15 Thin wall portion 14b of volute chamber 611Il, 1
The surface of 5b needs to be configured almost parallel to the rotation axis 2. If the deflection walls 14 and 15 are made as separate members in this method, if the deflection walls i4 and 15 are worn out, this can be easily done. can be exchanged for.

Furthermore, in the case shown in FIG. 9, the casing 3 and the casing cover 16 described in FIG. 8 are not separate bodies but are integrally constructed. Note that the deflection wall 14 shown in FIGS. 8 and 9
．． 15 can be manufactured by machining the cylindrical material shown in Fig. 10 into rings. In the next state, the skin groove 9 is formed within the groove 3d of the casing 3 or between the casing 3 and the casing cover 9/16.
4, 16a, and utilize the springback of this deflection wall 14.15 to create a valley groove! Sd, 9d or 16(
It is best to install the device inside the room.

Now, the velocity distribution of the flux discharged from the suitable bomb planner 1 is as shown in Fig. 11.
There is a tendency to lean toward Therefore, this work is called Bon Planner 1.
When a centrifugal pump incorporating a 19 Bonplanner 1
Weak flux discharged from the front shroud 411 of.

It is thought that this may obstruct the outflow of water and cause a mixing loss.

Therefore, in the embodiment shown in No. 15@, in order to reduce the secondary flow generated in the volute chamber 6 and to reduce the mixing loss t-, the volute chamber 6'i of the casing 3 is equipped with a front shroud with a small discharge flow velocity of a single bomb planner. It was designed to spread to all areas.

Of course, as in the embodiment already described, a deflection wall 11t is provided near the entrance of the volute chamber 6, and a flux mf returns to the outlet of the bomb planner 1 along the inner wall of the volute chamber 6: The flux is deflected in such a way that no velocity component is generated that opposes the flux. When the centrifugal pump is configured in this way and starts operating, the flux L1, which is discharged from the rear shroud 7@ of the Bon Planner 1 and has a high flow velocity, is guided toward the back of the volute chamber 6 which is widened in the front shroud 4gA of the Bon Planner 1. It will be destroyed. This flux recovers the pressure in the volute chamber 6 and
31 Loose friend, Bonplanner 1's front shracto 4
Therefore, if this structure is constructed, the small flux and the small flux that are discharged will not collide head-on. This reduces mixing loss in the volute chamber 6 and improves pump performance. The effect of providing the deflection wall 11 is the same as that of the embodiments already described, so a complete explanation will be omitted.

In the embodiment described above, two deflection walls were provided in the structure facing the end faces of the front and rear shrouds near the entrance of the volute chamber. It is also possible to provide only one side near the entrance of the volute chamber opposite to the volute chamber. In addition, in the embodiment, the tip of the deflection wall (the end face on the outlet side of the Bon Planner) was configured to extend toward the outlet side of the Bon Planner until just before facing the outlet, but the @ between the end faces of the deflection wall was The shape of the deflection wall may be selected to be wider than the width of the outlet of the bomb planner. Furthermore, in the embodiment, the surface of the deflection wall on the volute chamber side was made into a cylindrical surface almost parallel to the rotation axis, but this was configured so that the tip of the deflection wall was slightly inclined toward the central side pressure of the volute chamber. is also good.

Furthermore, other embodiments shown in Figures 14 to 16 will be described. In other words, Fig. 14 shows one in which the mutual gw of the deflection walls 11 is wider than the width of the outlet of the bomb planner 1;
5 shows a case in which the deflection wall 11 on the casing 3 side is provided on a surface substantially equal to the end surface of the bomb planner 1, and FIG.
1 is the front V-shaped; 4, which is provided only on the loud 4#, is shown in Figure 17, in which the deflection wall 11 is provided facing the shroud 4.7 on the front and rear surfaces.

Next[! More specific embodiments shown in FIG. 118 to JII21 will be described. Since the parts indicated by the same reference numbers as those in the embodiments already described have the same functions, their explanations will be omitted. 3b.

sa and sd are a pace, a suction 7 lunge, and a discharge fringe formed integrally with the casing 5 by casting, respectively. A mounting hole 17 for a gauge and a mounting hole 18 for priming water are provided on the upper S side in FIG. 18 of both flanges 30, 5d. Further, as shown in FIG. 21, a drain hole 19 is provided in the casing s from near the bottom of the volute violet 6 toward the winding start 4a of the volute 6 (back side in FIG. 18). Reference numeral 20 denotes a mounting hole for a cage, which is opened in the direction of the discharge flange 3d. 21-9
This is the 0 ring sandwiched between the spigot surface 2a.

A bearing box 25 has one end in contact with the casing cover 9, a main bearing 24 in the center, and a sub-bearing 25 in the other end.
It is attached to a bracket 261 provided with. This bearing box 2
6 is attached to the casing 3 by the port 27 so as to sandwich the casing cover 9 therebetween. A partition wall 2B is located 5m from the main shelf bracket 24 in the center of the bearing box 25.
will be established. Further, a ventilation passage 30 is partially opened between the outer race of the main bearing 24 and the inner wall surface of the bearing box 23.

29 is a slinger attached to the rotating shaft 2 outside the partition wall 2B; 51 is a bolt for attaching the bracket 26 that supports the outer race of the sub-bearing 25 to the end of the bearing box 23; As is clear from Fig. 6, the main bearing 24 has a larger capacity than the auxiliary bearing 25. In addition, the spigot surface 2Sai or bearing box 25 for attaching the bracket 26 is also provided.
The inner wall diameter of the main bearing 24 is selected to be larger than the outer diameter of the main bearing 24.
j This is an opening made in the bearing box 2s. 32 is a square packing for shaft sealing, and 55 is a cylindrical cavity opened in the center of the casing cover 9 to accommodate this square packing.
A seal holder 55 is a bolt that is screwed into the mating casing cover 9 for pressing and fixing the packing holder against the casing cover 9 side to ensure that the i-square packing 32 is placed in the cavity 33. S7 is a nut for attaching the bomb planner 1 to the shaft end of the rotary shaft 2, and is screwed into a threaded portion (not shown) provided at the shaft end while holding the washer 36 therebetween. 38 is an auxiliary leg attached to the lower part of the bearing box 23. 59 is cavity 5
This is a rectangular pressure water introduction pipe that supplies pressurized water in the casing 5 to the square packing 32 in the casing 3, seals the hole penetration part of the casing cover 9, and lubricates the square packing.

Now, such a structure can be assembled by the following steps. First, a main bearing 24 and a sub-bearing 25 are attached to the rotating shaft 2.
is press-fitted and installed. Next, the bearing box 25 is attached to the rotating shaft 2.
Main bearing 24. Reverse it so that the secondary bearing 25 is inserted in this order, and then attach the bracket 26 and fix it to the bearing box 24 with bolts S1.First, insert the slinger 29, packing holder 54, and square packing 32 into the rotating shaft 2. After that, the casing cover 9 is placed on the rotating shaft 2. Furthermore, attach bonder runner 1 to the shaft end and tighten bolt 37. After this, the casing 3 is placed in contact with the casing cover 9, and the casing 5 and the bearing box 2s are fixed with bolts 27 so that the casing cup (-9) is sandwiched between the casing 3 and the bearing box 23.Finally, the various bolts 27 Alternatively, you can complete a centrifugal pump by tightening the suction.

In the conventionally configured centrifugal pump, the mounting holes 17, 18. are provided in the casing 5. Since the drain holes 19 are provided facing in the same direction, these machining operations are simplified. Furthermore, since the mounting holes are provided so as to open in the same direction as the suction flange 3C, machining becomes easy. 3! Although the main bearing 24 and the sub-bearing 25 have different diameters, and the sub-bearing 25 with the smaller diameter is received through the bracket 26f, the assembly of the bearing box 25 is extremely easy. When a shaft joint is attached to the shaft end 2a of the la1 rotation@2 and the motor is connected via this @joint to start operation of the centrifugal pump, the slinger 29 acts to pass the air through the ventilation passage 30 on the outer rotor side of the main bearing 24. The sucked air passes through the shaft penetrating portion of the partition wall 2B and is discharged along the wall surface thereof. As a result, cooling 2 of the main bearing 24 is performed. Drain hole 19 in the housing
The hole 19 is opened toward the winding start side of the volute chamber 6, and the pressurized water discharged from the outlet 5 of the volute chamber 1 directly enters this hole 19 and does not disturb the flux inside the volute chamber 6, so when the pump is operating. This will reduce the loss.

Furthermore, to explain with reference to Figure 20, in this example, the width W of the entrance of the volute chamber is
The thickness W of the discharge port 5 is selected to be smaller, and the width W of the outlet port 5 is selected to be larger. That is, the extension surface of the inlet side of the pollute silkworm 6 is the shroud 4 on the front and rear surfaces of the bon planner 10.
．． It is configured to face the discharge side end surface 12 of No. 7.

That is, in this embodiment, the discharge side end surfaces of the shrouds 4.7 on the front and rear surfaces are used as deflection walls as in the above-described embodiment. In this way, the volume chamber 6
The flux l flowing along the wall surface is deflected by the discharge side end face 12 of the bomb planner 1, as indicated by m in the figure, and is discharged into the volute chamber 6 again together with the flux.

In addition, in such a case, since the bomb planner 1 moves in the axial direction due to the operation of the centrifugal pump, the
It is desirable that the extension surface of the inner wall of the volute chamber 6 be on the discharge side end surface 12. In addition, in the embodiment, the gear 1 lug G between the discharge side end face 12 of the Bon Planner and the casing 5 is selected to be approximately 0.5 to 4.0 W for the Bon Planner diameter of approximately 40 to 501 mm. . In addition, in the embodiment, the casing 5 bearings 11
A25 should be clamped and fixed, but this means that the casing cover 9t is fixed to the bearing box 23, and this casing cover 9
It is also possible to fix the casing 5t in sequence.

As is clear from the above description, the present invention provides a deflection wall of the Bon planner that deflects the flux returning to the outlet side of the Bon planner along the inner wall of the pollute chamber so that a velocity component opposite to the discharge flow from the Bon planner does not occur. It is placed around the According to the invention, therefore, the discharge ζ of the bone planner.

The flow of water from the mouth becomes smoother and pump performance improves.

[Brief explanation of the drawing]

Figures 1 and 2 are diagonal cross-sectional views explaining the structure of a conventional spiral bong 1, Figures 5 and 4 are the next diagrams explaining how water flows near the volute chamber, Figure 5 The figure is a sectional view for explaining one embodiment of the present invention, Figure 6 is an enlarged sectional view for explaining the main part of Figure i@5, and Figure 7 is for explaining another embodiment. Figures 8 and 9 are cross-sectional views for explaining other embodiments, Figure #110 is a diagram for explaining details M of the deflection wall, and Figure 11 is a diagram showing the flux discharged from the bomb planner. A diagram showing the velocity distribution, FIG. 12 is a diagram explaining an example of the flow of water in the volute chamber, FIG. 13 is a cross-sectional diagram to explain another example, and FIG. 14 to @1
7 is a sectional view for explaining other embodiments, FIG. 18 is a partial sectional view for explaining a more specific embodiment, and FIG. 19 is a sectional view for explaining the main part of FIG. 18. Me diagram,
FIG. 20 is a partial cross-sectional view for explaining the relationship between the volute chamber and the bomb planner, and FIG. 21- is a cross-sectional view of the casing portion. 1...Bonplanner, 3...Casing, 5...
Outlet port, 6... volute chamber, 8... opening,
9... Casing cover, 11... Deflection wall, 14.
15...Deflection s, L...Flux from the outlet of the bomb planner, T...Flux along the inner wall of the volute chamber. Figure 1, Figure 3, Figure Blue, Figure 2, Figure 4 - Ritsu, Figure 5, and Figure 5.

Claims (1)

[Claims] 1. A flux returning along the inner wall of the volute chamber to the outlet of the volute chamber in a device comprising a volute chamber and a casing that covers the outlet of the volute chamber and forms a porlute chamber around the volute chamber. A deflection wall is provided to deflect the discharge flow from the Bon Planner in a manner that prevents the opposing velocity component from occurring. A pump casing that covers the bon planner and forms a volute chamber around the volute chamber and has an opening that opens the rear surface of the bon planner, and a casing cover that covers the opening of the bon planner. A deflection wall is provided extending from the casing cover toward the outlet of the Bonplanner to deflect the flux returning to the outlet of the Bonplanner along the inner wall so that a fast reaction component that opposes the discharge flow of the Bonplanner is not generated. Thin layer pump characterized by: 3. In a pump equipped with a volute chamber and a casing that covers the outlet of the volute chamber and forms a volume chamber around the volute chamber, the flow returns to the outlet of the volute along the inner wall of the volute chamber. A swirl characterized in that a circular tubular deflection wall for deflecting the bundle so that a continuous component that opposes the discharge flow from the Bon planner is not generated is provided near the discharge side end face of the front shroud or the rear shroud of the Bon planner. Volume pump 0