JPS6313435Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to the structure of a submersible motor pump.

Conventionally, submersible motor pumps have a pump section and a motor section that are integrally constructed, and this structure is not necessarily easy to disassemble and reassemble. On the other hand, even submersible motor pumps used for civil engineering work suck in sewage containing sand and mud, which increases the wear and tear of the pump, so sufficient maintenance is required, and the usage conditions are harsh. This may cause an overload on the motor. Therefore, among submersible motor pumps, those for civil engineering work require sufficient maintenance on a regular or irregular basis.

However, many conventional submersible motor pumps are difficult to disassemble and reassemble. In particular, many motors are difficult to disassemble, and some cannot be disassembled without disassembling the pump side. In addition, there are some mechanical seals in which the sealed oil cannot be drained without removing the impeller to inspect the mechanical seal.

For example, if you want to remove only the pump cover that allows water discharged from the pump to pass through the outer circumference of the motor, you have to remove both the motor frame and rotor, or you have to disassemble the upper bracket of the motor, which results in almost disassembling the motor. Another example is that the cable connector installation port is fixed to the pump cover, and the cable connector can only be removed from inside the pump cover, so when the pump cover is removed, the cable connector attachment port is fixed to the pump cover. There are some cases where the lead wire from the child coil ends up sticking out.

As a conventional example, there is a device disclosed in Japanese Utility Model Publication No. 38-23277. In this conventional example, the motor frame is in contact with the pump casing via a sealing member, and it is not disclosed that the motor frame can be disassembled from the motor side. Conventional example, 1977-
In the devices disclosed in Japanese Unexamined Patent Publication No. 5005 and Japanese Utility Model Application Publication No. 49-7502, the motor frame cannot be disassembled without disassembling the pump section. Furthermore, in these conventional examples, the pump cover cannot be taken out of the motor frame unless the underwater cable is separated, making it difficult to disassemble the pump cover.

This idea is a submersible motor pump in which the motor part can be disassembled sequentially from the outside, regardless of the pump part.The pump cover can be easily disassembled without disassembling the motor, and the stator, etc., excluding the rotor and main shaft, can be removed from the motor side. It is an object of the present invention to provide a submersible motor pump that can be disassembled while the assembled motor frame is partially assembled.

This device has a motor section at the top and a pump section at the bottom.The motor section is covered by a pump cover at a distance outside the motor frame, and a discharge passage is formed between the motor frame and the pump cover, and a bearing is fitted into the motor frame. In a submersible motor pump in which the upper bracket that fits into the plate and the bearing plate is bolted together, the motor part is placed on the lower bracket, all connecting parts are watertight, and the pump cover is held between the end cover and the lower bracket on the outside. The submersible motor pump is characterized by having an end cover with a discharge pipe connecting member bolted to the upper bracket, and a motor frame fixed to the lower bracket from the motor frame side on the inside.

In this device, the pump cover is disassembled when the end cover and lower bracket are released.
Then, by releasing the fixation between the motor frame and the lower bracket, the motor frame and each member supported by the motor frame can be disassembled as one unit.

Embodiments of this invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of the submersible motor pump of this invention. The figure is shown rotated 90 degrees, with the top on the right side of the figure.

The lower bracket 1 and the intermediate casing 2 are fitted together via a sealing ring 3, and bolts 4 are screwed into the female threads of the lower bracket 1 through bolt holes in the intermediate casing 2 and fastened together.

A discharge water passage 5 is provided in the lower bracket 1 and the intermediate casing 2, and a shaft sealing device 6 is installed between them. Sleeve 1 fitted with 11
2, and the lower bracket 1
Lubricating and cooling oil for the shaft sealing device 6 can be taken in and out of the space between the lower bracket 1 and the intermediate casing 2 by means of a plug 13 provided therein. Of course,
The shaft sealing device 6 may have a conventional structure in which it is directly inserted into the main shaft 7.

A liner ring 14 is fitted into the lower part of the intermediate casing 2. An impeller 18 is fixed by a blade retaining nut 17 that is fitted into the main shaft 7 end via a key 15 and screwed into the main shaft 7 end via a washer 16, and the annular protrusion on the back of the blade of the impeller 18 Fit the ring 14 with a small gap, and then liner ring 1.
The lip of the oil seal 19 fitted into the impeller 18 is in contact with the boss of the impeller 18. The stay bolt 22 is inserted through the bolt hole of the pump casing 21 containing the impeller 18 and screwed into the female thread of the intermediate casing 2.
is fixed. A suction cover 23 is fitted into the pump casing 21 with a sealant applied to its contact surface, and bolts 24 are inserted into the bolt holes of the suction cover 23 and screwed into the pump casing 21. The pump casing 21 has an opening in the center through which the impeller 18 passes.

The strainer 25 fitted on the outer periphery of the attachment part of the pump casing 21 to the intermediate casing 2 is held down by the pump stand 26 which has a spiral edge fitted on the outer periphery. It is opened and tightened with a nut 27 screwed into the end of the stay bolt 22.

The main shaft 7 has a lower ball bearing 28 fitted into the lower bracket 1, a sealing ring 29 inserted between it and the lower bracket 1, and a sealing ring 3 fitted into the motor frame 31.
It is supported by an upper ball bearing 34 that is fitted into a bearing plate 33 that is inserted into the upper ball bearing 34. Lower ball bearing 28
The press plate 28a is fixed to the lower bracket 1 with a set screw 28b so as to be pressed by the press plate 28a, and a wave washer 34b is elastically inserted between the upper ball bearing 34 and the bearing plate 33. A rotor 35 is fixed to the main shaft 7, and a stator 36 is fixed to the motor frame 31. Motor frame 31
is fixed to the lower bracket 1 by inserting a bolt hole in the lower end flange of the motor frame 31 and screwing a bolt 38 into the female thread of the lower bracket 1.

An upper bracket 41 is fitted into the bearing plate 33 with a sealing ring 39 in between.
1. Insert the bolt 42 through the bolt hole of the bearing plate 33
is screwed and fastened to the motor frame 31.

A cylindrical pump cover 44 that covers the motor frame 31 and forms a passage 43 for discharged water between the motor frame 31 and the motor frame 31 has an elastic boot 45 fitted in its lower end. The upper end part is fitted with an elastic boot 46, and the boot 46
is fitted into the spigot of the end cover 47. The inner side of the upper end surface of the end cover 47 is pressed against the upper bracket 41 via a packing 48, and bolts 49 are inserted into the bolt holes of the end cover 47 and the packing 48 and screwed into the upper bracket 41. A hose coupling 51 contacts the end cover 47 via a packing 52, and a bolt 53 is inserted into the bolt hole of the hose coupling 51 and the packing 52 and screwed into the end cover 47. Although not shown, the hose coupling spring 51
The hose is also connected to the hose joint.

From the swirl chamber of the pump casing 21, the discharge water passes through the passage 5 of the intermediate casing 2 and the lower bracket 1, and is then connected to the pump cover 44 and the motor frame 31.
The discharge water that has flowed to the end cover 47 through the passage 43 between the two is discharged from the hose coupling 51.

The upper bracket 41 has an underwater cable 5 at the top.
A connector seat 56 into which a connector 55 that guides the connector 4 into the motor section is inserted in a watertight manner is integrally formed, and the cylindrical seat 56 protrudes from the end cover 47 so as to be able to go in and out.
A bolt 57 is inserted into a bolt hole of a connector 55 that fits into the connector seat 56 and screwed into the connector seat 56.

An auto cut 58 is fixed to the bearing plate 33 within the upper bracket 41. The bearing plate 33 is provided with holes for wiring between the stator 36 and the terminal 62 of the connector 55 and between the auto cut 58 and the stator 36.

The handle 64 is attached to the end cover 47 with the bolt 6
It is fixed by 5. Although the handle 64 is not shown, it is similarly fixed at a portion of the end cover 47 located away from the bolt 65 shown in the drawing. An underwater cable holder 66, which will be shown later, is detachably engaged with the handle 64.

In the above description, the sealing rings 3, 29, 32, and 39 are of the same size, and the spigots sealed by these rings have the same diameter.

FIG. 2 is a plan view of the underwater cable holder 66. The underwater cable holder 66 has an annular shape 67
It is formed like this and has a cut 69 in a part,
On the outside of the ring, a lever 71 is pivoted to the ring ring 67 with a pin 72 so as to close the cut 69 from the outside. Cut 6
9 is biased to rotate in the direction of closing.
When the lever presser 71a is pressed, the lever 71 rotates in a direction away from the cut 69 against the leaf spring 70. After bundling and winding the underwater cable 54, or when bundling and winding, press the lever presser 71a to insert the underwater cable 54, and then insert the underwater cable 54 through the cut 69 in the handle 64, so that the underwater cable 54 will not be cluttered and will be convenient to carry. This is the result.

FIG. 3 is a drawing showing the structure of a conventional shaft seal. Fixed liner ring 7 to which sliding ring 74 is fixed
5 has a sealing ring 76 fitted on its outer periphery, is fitted into the intermediate casing 2, and is prevented from coming off in the axial direction by a retaining plate 78 fixed to the intermediate casing 2 with machine screws 77, and the inner diameter of the fixed liner ring 75 is
is inserted into.

FIG. 4 is a drawing showing details of the shaft seal portion of the present invention.

Fixed liner ring 75 to which sliding ring 74 is fixed
is fitted with a sealing ring 76 on its outer periphery, is fitted into the intermediate casing 2, and is prevented from coming out in the axial direction by a retaining plate 78 fixed to the intermediate casing 2 with machine screws 77, and the inner diameter of the fixed liner ring 75 is different from that of the sleeve 12. It is made in a gap that creates a throttle effect. The sliding ring 79 is fitted into the central boss portion of the lower bracket 1, and a moving ring 82 made of an elastic body with a pair of sliding rings 81 fixed between the sliding rings 74 and 79 is axially sealed to the sleeve 12 and moved in the axial direction. A spring 83 is compressed and inserted between the moving rings 82 and the sliding rings 81 and 74, 7 are inserted into the moving rings 82.
9, respectively.

Disassembly of the motor section of the submersible motor pump configured as described above will be explained.

Although the hose serving as the discharge pipe is not shown, the hose joint may be removed from the hose coupling 51, or the bolt 53 may be removed and the hose coupling 51 may be removed with the hose coupling 51 attached.

By removing the bolts 49, the end cover 47 can be removed from the boot 46.

When the end cover 47 is removed, the pump cover 4
4 can be pulled out from the lower bracket 1 together with the boot 45. Therefore, the pump cover 44 can be removed and replaced without touching the electrical components.

I will talk about disassembling the motor. The motor can be disassembled sequentially or depending on the parts of the motor to be inspected. First, we will discuss the case of sequential decomposition.

When the bolt 57 is removed, the connector 55 can be pulled out from the connector seat 56. terminal 62
The connector 55 is separated by removing the wires that have been drawn out. In this state, the underwater cable 54
You can see the continuity.

When the bolts 42 are removed, the upper bracket 41 is removed from the bearing plate 33. At this time, do not remove the connector 55, leave it fixed to the upper bracket 41, and connect the stator 36,
The wiring from the auto cut 58 may be removed. In this state, the stator 36 and the auto-cut 58 can be inspected for continuity, etc., and the auto-cut 58 can be replaced.

When the bearing plate 33 is raised in the axial direction, it comes off from the motor frame 31 and also separates from the upper ball bearing 34. In this state, the upper ball bearing 34 can be inspected and replaced, and a part of the state of the rotor 35 and stator 36 can be seen.

When the bolts 38 are removed and the motor frame 31 is moved upward in the axial direction, it is removed from the lower bracket 1 and the stator 36 rises together with it. In this state, the states of the stator 36, rotor 35, and lower ball bearing 28 can be inspected.

If you only want to check the condition of the rotor 35, stator 36, and lower ball bearing 28, or if the motor is a dry type and you want to check whether it is submerged in water, remove the end cover 47 and pump cover 44, and then remove the bolts 38. When the motor frame 31 is lifted, the bearing plate 3 fixed to the motor frame 31 is removed.
3. The upper bracket 41 and those attached thereto are lifted up as one, and the bearing plate 33 is lifted up leaving the upper ball bearing 34 on the main shaft 7, and the rotor 35 is lifted up.
appears, and the upper part of the lower bracket 1 also appears, making it possible to inspect the rotor 35, stator 36, and lower ball bearing 28 for water intrusion.

To remove the lower ball bearing 28, first remove the impeller 18, then remove all but the lower bracket 1, as shown above, and remove the retaining plate 28a of the lower ball bearing 28 from the stopper attached. screw 28
b and remove the holding plate 28a, and pull the main shaft 7 upward.The main shaft 7 is pulled up with the rotor 35, upper ball bearing 34, collar 34a, and lower ball bearing 28 attached, and slides inside the sleeve 12. Extract. Thus, the lower ball bearing 28 can be replaced.

Assembly is in the reverse order as described above. That is, the lower ball bearing 28, the rotor 35, the collar 34
a. Fit the main shaft 7 with the upper ball bearing 34 and wave washer 34b assembled into the sleeve 12 and pass it through, fit the lower ball bearing 28 into the bearing house of the lower bracket 1, apply the retaining plate 28a, and tighten the setscrew. It is locked at 28b. Next are the motor frame 31, bearing plate 33, and upper bracket 4.
1 with a built-in auto cut 58, or a connector 55 connected to the underwater cable 54 by a connector 55, is inserted into the connector seat 56, and fixed with bolts 57, and then these assemblies are attached to the main shaft 7 and the rotor 35. , insert the motor frame 31 into the lower bracket 1 with the sealing ring 29 in between, fit the bearing house of the bearing plate 33 into the upper ball bearing 34 at the upper part, and attach the motor frame 31 to the lower bracket with the bolt 38. 1. When the connector 55 is not attached, the stator 36 is connected to the terminal 62.
Connect the wiring of auto cut 58 and connect it to connector 5.
5 into the connector seat 56 and fixed with bolts 57.

When assembling individual units in sequence, after attaching the main shaft 7 to the lower bracket 1 via the lower ball bearing 28,
A motor frame 31 equipped with a stator 36 is fitted into the lower bracket 1 with a sealing ring 29 interposed therebetween, and fastened with bolts 38. Next, sealing ring 3
2 into the motor frame 31, and the bearing plate 33
is fitted into the motor frame 31 and into the upper ball bearing 34.

Next, attach the auto-cut 58 and pull out its wiring and the wiring of the stator 36 through the center hole of the connector seat 56 of the upper bracket 41.
1, and then tighten the upper bracket 4 with the bolt 42.
1. Fasten the bearing plate 33 and motor frame 31.

The wires drawn out to the terminals 62 of the connector 55 are connected and inserted into the connector seat 56, and the connector 55 is fixed with bolts 57.

Pump cover 4 fitted with boots 45 and 46
Fit the boots 45 of 4 into the lower bracket 1,
An end cover 47 is fitted into the boot 46 and fixed to the upper bracket 41 with bolts 49. If the hose coupling 51 has been removed, the hose coupling 51 is brought into contact with the end cover 47 via the gasket 52 and fixed with the bolt 53.

As described above, the submersible motor pump of this invention has a motor section at the top and a pump section at the bottom.
The motor section is covered by a pump cover at a distance from the outside of the motor frame, and a discharge passage is formed between the motor frame and the pump cover, and a bearing plate that fits into the motor frame and an upper bracket that fits into the bearing plate are bolted together. In the motor pump, the motor section has a pump cover that is held between an end cover and a lower bracket on the outside, and an end cover that has a discharge pipe connecting member that is bolted to the upper bracket, so the pump cover can be easily disassembled. The pump discharge flow path can be inspected regardless of the motor. Since the motor part has a motor frame fixed to the lower bracket from the motor frame side on the inside, the motor has to be removed by removing the motor frame on the stator side, the bearing plate, the upper bracket, and anything attached to these. By separating the lower bracket while it is still partially assembled, you can avoid flooding, rotor abnormalities, lower ball bearings, etc.
You can check the condition of the upper ball bearing. These motor parts can be disassembled while the submersible motor pump is placed vertically, and there is no need to unnecessarily disassemble the impeller or shaft sealing device.

Therefore, it is easy to inspect the submersible motor pump for construction use, and there is no need for unnecessary disassembly for preventive maintenance or periodic inspection, and the disassembly does not take much time.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an embodiment of this invention, Fig. 2 is a plan view of a part of Fig. 1, Fig. 3 is a conventional view of a part of Fig. 1, and Fig. 4 is a diagram of a part of Fig. 1. It is a partial enlarged longitudinal cross-sectional view. 1...Lower bracket, 28...Lower ball bearing,
31...Motor frame, 33...Bearing plate, 34
... Upper ball bearing, 35 ... Rotor, 36 ... Stator, 38 ... Bolt, 41 ... Upper bracket, 42 ... Bolt, 44 ... Pump cover, 4
5, 46...Boots, 47...End cover, 4
9... Bolt, 54... Underwater cable, 55...
Connector, 56...Connector seat, 57...Bolt, 58...Auto cut, 64...Handle,
65...Bolt, 66...Underwater cable holder.

Claims (1)

[Scope of utility model registration request] The motor part is equipped with a motor part at the top and a pump part at the bottom.The motor part is covered by a pump cover at a distance outside the motor frame, and the discharge passage is formed between the motor frame and the pump cover.A bearing plate and a bearing are fitted into the motor frame. In a submersible motor pump in which the upper bracket that fits into the plate is bolted, the motor part is placed on the lower bracket, all connection parts are watertight, and the pump cover is held between the end cover and the lower bracket on the outside, and the upper 1. A submersible motor pump comprising: an end cover having a discharge pipe connecting member bolted to a bracket; and a motor frame fixed to the lower bracket from the motor frame side on the inside.