KR101647553B1 - Mud pump - Google Patents

Abstract

SUMMARY OF THE INVENTION The present invention provides a mud pump capable of preventing a foreign matter from penetrating into a pump as much as possible. The mud pump of the present invention comprises a casing (10) having an axial inlet (12) and a circumferential outlet (14); An impeller 20 installed inside the casing and capable of supplying the mud from the inlet to the outlet by rotation; A rotary shaft (40) rotated by an external driving source and connected to the impeller by a rotary shaft coupling part (22) of the impeller; A frame (50) which rotatably supports the rotary shaft and is fixed to the casing (10); And a rotary shaft support portion (34) extending radially inwardly of the frame (50) at a center portion thereof, the rotary shaft support portion (34) being supported between the frame (50) and the casing A stuffing box 30; And sealing means provided between the rotary shaft support portion 34 of the stuffing box and the rotary shaft to prevent foreign matter contained in the mud from penetrating into the frame. The sealing means includes a plurality of gland packing (64) installed between the sleeve and the rotary shaft support on the outer side with respect to the inner extension, a mechanical seal mounted on the rotary shaft of the impeller with respect to the inner extension, And a sealing ring provided between the seal and the inner extension portion.

Description

Mud pump

The present invention relates to a mud pump, and more particularly, to a mud pump configured to sufficiently prevent water or the like contained in a mud from penetrating into the interior of the mud during a supply process of the mud.

In general, drill ship is equipped with drilling equipment used for development of oil field, and mud is supplied as drill bit for heat dissipation in the process of drilling ground in the sea floor. And the crushed material such as crushed rock generated by the operation of the drill bit is recovered again with the supplied mud. Then, the recovered mud is circulated to the mud tank, and it is reused after processing the impurities.

The mud used in this way is supplied by a mud pump. Various types of such a mud pump are used. For example, the Korean Utility Model Publication No. 10-2013-0090105, which is an example of the mud pump, has a complicated structure because it has a large number of oil passages therein. In addition, a piston type pump may be used, but it is also pointed out that this is also somewhat complicated in terms of construction.

Other types of mud pumps include those disclosed in U.S. Patent No. 7,232,288. Although such a mud pump can have a simple structural advantage by using a single impeller, it does not mention any technology to completely prevent impurities from entering the rotating shaft portion rotating the impeller under the high pressure environment actually used I can not say that I can not.

When the impeller is used to supply the mud, the impeller is rotated by the motor, the impeller is rotated by the rotary shaft, and the impeller is supported by the impeller, and between the fixed portion constituting the pumping structure of the mud, It is necessary to be able to reliably block infiltration of foreign substances such as water and fine dust. It is a matter of course that when the foreign substance constituting the mud penetrates between the rotating body of the pump and the fixed body supporting the rotating body in the process of circulating the mud, it is obvious that the normal operation becomes difficult, and furthermore, can do. In addition, the mud pump used in such an environment can be said to be advantageous in various aspects as the structure is substantially simplified.

It is an object of the present invention to provide a mud pump having a simpler structure.

Another object of the present invention is to provide a mud pump capable of preventing the foreign matter in the mud from penetrating between the rotating body and the fixed body as much as possible. Preventing foreign matter from penetrating between the rotating body and the fixed body substantially improves the durability of the pump substantially and prevents damage due to penetration of foreign matter, thereby basically raising the reliability of the pump.

The mud pump according to the present invention may also be used, for example, as a sand pump capable of pumping sand collected in water. Further, the pump of the present invention may also be used to pump a gaseous flow material containing solid particles.

According to an aspect of the present invention, there is provided a mud pump including: a casing having an inlet in an axial direction and an outlet in a circumferential direction; An impeller installed inside the casing and capable of supplying the mud from the inlet to the outlet by rotation; A rotating shaft which is rotated by an external driving source and is connected to the impeller by the rotating shaft coupling portion of the impeller; A frame rotatably supporting the rotation shaft and fixed to the casing; A stuffing box which is provided between the frame and the casing and has a rotary shaft support portion which extends from the center portion to the inside of the frame and which extends partly on the back surface which is an opposite side to the inlet side of the casing; And sealing means provided between the rotary shaft support and the rotary shaft of the stuffing box to prevent foreign matter contained in the mud from penetrating into the interior of the frame.

According to the embodiment of the present invention, a cylindrical sleeve is provided on a rotary shaft corresponding to the inside of the rotary shaft support portion, and an inner extension portion extending inward to contact the sleeve is formed on the inner side of the rotary shaft support portion. The sealing means may include a plurality of gland packing provided between the sleeve and the rotary shaft support on the outer side with respect to the inner extension portion, a mechanical seal provided on the rotary shaft of the impeller with respect to the inner extension portion, And a sealing ring provided between the extended portions.

Here, the mechanical seal is elastically supported by the seal ring by a spring provided on the back side of the impeller, and the mechanical seal is closely attached to the seal ring by the elastic force of the spring. Therefore, even if the mechanical seal is worn, it is always brought into close contact with the sealing ring, thereby preventing the penetration of foreign matter.

The sealing ring is supported on the mechanical seal side by a pin provided on the inner extending portion. With such a structure, the assembling and disassembling of the sealing ring will become more convenient.

According to another embodiment of the present invention, the grand packing includes an insertion portion inserted into the end portion of the rotary shaft support portion, and a flange portion contacting the end portion of the rotary shaft support portion, and is supported by a grand cap fastened and fixed to the rotary shaft support portion. do.

According to another embodiment of the present invention, a deflector is provided on the rotating shaft corresponding to the inside of the grand cap, and the deflector is formed in the outer circumferential portion of the concave circular arc-shaped cross section so as to reflect foreign matter penetrating into the grand cap side have.

According to the present invention, it is preferable that the blades of the impeller are formed to be convex and streamlined toward the downstream side in the rotating direction.

As described above, according to the present invention, when the muff pump is operated, foreign matter contained in the mud can be prevented from flowing into the frame through the rotating shaft as much as possible. Also, it can be seen that the gland packing and the mechanical seal for preventing the penetration of foreign matter are stably supported by the surrounding parts, so that sufficient foreign matter can be prevented. Therefore, it is expected that the durability and the reliability can be improved even under the environment such as the pumping of the mud.

Since the foreign material penetrated into the inside of the frame by the deflector is reflected in a direction opposite to the position where the bearings are embedded, it can be seen that the degree of rotation of foreign objects is further increased. Further, according to the shape of the blades of the present invention, it is possible to provide a stable and stable supply of the material in the same state as the mud, and at the same time, it is possible to expect an action effect of preventing the damage by the reaction force as much as possible.

1 is an exploded perspective view showing a casing of a pump according to the present invention.
2 is an exemplary perspective view showing the impeller of the present invention.
3 is a sectional view of the pump of the present invention.
4 is an enlarged cross-sectional view of the main portion of the pump of the present invention.

Hereinafter, the present invention will be described in more detail based on the embodiments shown in the drawings. As shown in Fig. 1 showing the appearance of the pump of the present invention, the casing 10 of the present invention is constituted by an upper casing 10A and a lower casing 10B which are symmetrical to each other. Such a casing 10 has an inlet 12 formed in the axial direction and an outlet 14 through which the mud introduced through the inlet 12 is discharged at a constant discharge pressure.

An impeller 20 as shown in FIG. 2 is installed in the casing 10. The impeller 20 generates a force to suck mud or sand through the inlet 12 and to discharge it through the outlet 14, as will be described later. The impeller 20 includes a rotary shaft coupling portion 22 formed at a central portion to which a rotary shaft to be described later is coupled and a plurality of blades 24 radially extending and formed around the rotary shaft coupling portion 22 have.

The blade 24 according to the present invention extends radially with respect to the axial direction, and it can be seen that the blade 24 is formed into a convexly streamlined shape toward the downstream side with respect to the rotation direction. The shape of the blade 24 is such that the pump of the present invention is not a gas or a liquid but an object such as a mud or a sand so that an excessive load is applied to the blade 24 during rotation, So as to prevent damage.

For example, when the blade 24 rotates in the direction of the arrow shown in the drawing, a large load may be applied to the outer end of the blade 24. However, as in the present invention, the outer end of the blade 24 is formed into a streamlined shape toward the upstream side. It is possible to prevent the blade 24 from acting on the end portion thereof. At the same time, the shape of the blade 24 may be capable of discharging the mud to the outlet 14 side without excessive load being applied to the end of the blade 24 when pumping a conveying object such as a mud or sand.

Substantially, the mud pump of the present invention is used to convey an object such as a mud or sand, and does not need to be under high pressure. Therefore, the shape of the blade 24 as described above is expected to be preferable in terms of proper pumping ability and prevention of excessive load on the blade, because the transfer object can be sufficiently transferred even at a low pressure.

Next, the overall structure of the mud pump of the present invention will be described with reference to FIG. 3 and FIG. The casing 10 has an axial inlet 12 and a circumferential outlet 14 and the opposite side of the inlet 12 is closed by a stuffing box 30. The stuffing box 30 is a part that forms the opposite side of the inlet of the impeller 20 while rotatably housing the impeller 20.

The stuffing box 30 is supported between the casing 10 and the frame 10 by a frame 50 coupled to the backing (left side in the drawing). That is, the right end of the frame 50 is coupled to the casing by bolts, and the stuffing box 30 is supported therebetween. The flange 32 formed on the radial edge portion of the stuffing box 30 may be engaged with the casing 10 by bolts in a state where the flange 32 is hooked on the support tab 15 formed on the casing 10, Thereby being held at a predetermined position therebetween.

The frame 50, which is bolted to the casing 10 and supported, is for supporting the rotating shaft 40 and has a rotating shaft penetrating portion 52. The rotating shaft penetrating part 52 is a part capable of supporting both sides of the rotating shaft 40 and is formed in such a state that the rotating shaft 40 can be penetrated through both sides thereof. One side (the right side portion in the figure) of the rotating shaft penetrating portion 52 is sealed by the cover 54 and the other side (left side portion in the drawing) is closed by sealing the outer side ends of the housing 56a and the housing 56a Which is composed of a cover 56b which is made of a metal.

A plurality of bearings 55 and 57 are installed inside the cover 54 and inside the bearing housing 56 so that the rotary shaft 40 is rotatably supported at two places. Lubricating oil is supplied to the inside of the rotating shaft penetrating portion 52 so that the bearings 55 and 57 supporting the rotating shaft 40 can have a lubrication function. As described above, the cover 54 and the bearing housing (56).

The end of the rotating shaft 40 supported by the rotating shaft penetrating portion 52 is coupled to the rotating shaft engaging portion 22 of the impeller 20 so that the rotation of the rotating shaft 40 is transmitted to the impeller 20, As shown in Fig. Here, the back surface (left end in the drawing) of the impeller 20 and the outer surface (right end in the drawing) of the stuffing box 30 are coupled as close as possible to each other, And the like to the inside of the frame 50 as much as possible. The right end of the rotation shaft 40 is engaged with the rotation shaft 40 through the rotation shaft support 34 of the stuffing box 30. The rotary shaft support portion 34 of the stuffing box 30 is a cylindrical portion that extends inward of the frame 50 at the rear of the center portion of the stuffing box.

Next, a structure between the rotary shaft support 34 and the rotary shaft 40 of the stuffing box 30 will be described with reference to FIG. As described above, the impeller 30 transports the mud, the sand or the like. When the impeller 30 flows into the frame 50, it causes a problem in operation of the pump. Therefore, it is preferable that the mud or the like is not penetrated through the inside of the rotation axis support portion 34 of the stuffing box 30 forming part of the back surface of the casing 10.

According to the present invention, there is provided between the rotation shaft support portion 34 of the stuffing box 30 and the rotation shaft 40 a means for preventing foreign matter from penetrating. The rotation shaft support 34 of the stuffing box 30 has a cylindrical shape extending inward of the frame 50 as described above. An inner extension portion 34a extending inward is formed inside the rotation axis support portion 34 so that a constant gap is formed between the rotation axis support portion 34 and the rotation axis 40 at a portion except for this portion .

In the illustrated embodiment, the cylindrical sleeve 42 is fixed to the outer portion of the rotary shaft 40, so that substantially the space between the rotary shaft 40 and the sleeve 42 is formed by the inner extending portion 34a ) Are kept as close as possible to each other in the molded part, but they are spaced apart from each other at the other parts. Accordingly, a plurality of grand packings 64 (three in the illustrated embodiment) are provided on the left side of the inner extension portion 34a.

A grand cap 66 is provided on the right end of the rotary shaft support part 43 so that the plurality of the grand packing 64 can be held inside the rotary shaft support part 34. That is, the cylindrical insertion portion 66a of the grand cap 66 is inserted into the inside of the rotary shaft support portion 43 to push the gland packing 64, and the flange portion 66b of the gland cap 66 Is fastened to the rotary shaft supporter 34 by a bolt or the like and remains fixed.

A sealing ring 62 is provided at a right side portion in the drawing centering on the inner extended portion 34a of the rotary shaft supporting portion 34. Since the sealing ring 62 is supported by the rotary shaft supporter 34 and one side (left side) thereof is supported by the pin 63 provided on the inner extended portion 34a, There may be advantages. A sealing ring 62a is provided between the sealing ring 62 and the rotary shaft support 34 to more securely prevent foreign matter from penetrating.

On the right side of the sealing ring 62, a mechanical seal 60 is provided on the sleeve 42. The mechanical seal 60 is also provided to prevent foreign matter from penetrating and to rotate like the sleeve 42 fixed to the rotating shaft 40. A spring (70) is interposed between the mechanical seal (60) and the bottom surface of the impeller (20). In the illustrated embodiment, the spring 70 is installed between the mechanical seal 60 and the guide 25 attached to the back of the impeller 20.

Here, the guide 25 and the sleeve 42 are considered to be very useful in terms of post-maintenance such as replacement when the wear of the pump due to the long-time driving of the pump according to the present invention occurs. Further, the mechanical seal 60 is in contact with the sealing ring 62 as described above, which can also be said to prevent penetration of foreign matter. The contact portion of the mechanical seal 60 in contact with the sealing ring 62 is worn out and the spring 70 urges the mechanical seal 60 toward the sealing ring 62, The seal 60 and the sealing ring 62 are always brought into tight contact with each other at a constant pressure. Therefore, the mechanical seal 60 maintains a state of being always in close contact with the sealing ring 62, so that it is possible to prevent foreign matter from penetrating more effectively.

According to the structure of the present invention as described above, in order to prevent foreign matter from penetrating from the impeller 20 side, the mechanical seal 60 pressed by the spring 70 and the mechanical seal 60 urged by the sealing ring 62 And a large number of the grand packings 64 are used. However, since the mud contains very fine particles, it is impossible to completely exclude the possibility that such fine particles penetrate through the gap as described above.

Therefore, in the present invention, a deflector 68 is provided on the rotation shaft 40 corresponding to the inside (the left side in the figure) of the grand cap 66. [ The deflector 68 is fixed to the rotary shaft 40 by, for example, bolting, and a reflector 68a having an arcuate cross section is formed on the outer periphery thereof. The reflection portion 68a reflects foreign matter that can permeate through the rotation shaft 40 and the above-described grand packing 64 toward the right side of the drawing, that is, toward the grand cap 66, Thereby preventing the inside of the portion 52 from approaching.

In the present invention, a plurality of packings are provided to prevent foreign matter of the mud from penetrating into the inside of the frame 50. For example, a packing 68b provided between the deflector 68 and the rotary shaft 40, A packing 62a provided between the sealing ring 62 and the inner circumferential surface of the rotary shaft supporter 34, a packing 60a provided between the mechanical seal 600 and the sleeve 42, A packing 42a provided at the contact portion of the impeller 22, etc. In addition, it is a matter of course that the packing can be provided at the portion where the foreign substance can permeate the mud or the like.

As described above, according to the present invention, when the impeller is rotated by the rotating shaft 40 rotated by the external driving source, sufficient sealing is enabled between the fixed portion and the rotating portion, And durability can be improved.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventive concept as defined by the appended claims. It is natural that it should be.

10 ..... casing
12 ..... entrance
Exit 14 .....
20 ..... Impeller
22 ..... rotation shaft coupling portion
24 ..... blades
25 ..... guides
30 ..... stuffing box
32 ..... flange section
34 ..... The rotary shaft support
34a ..... internal extension
40 ..... rotation shaft
42 ..... Sleeve
50 ..... frame
52 ..... rotation shaft penetration part
54 ..... cover
55, 57 ..... Bearings
56 ..... Bearing housings
60 ..... mechanical seal
66 ..... Grand Cap
66a ..... insertion portion
66b ..... flange portion
68 ..... deflector
68a.
70 ..... spring

Claims (7)

A casing (10) having an axial inlet (12) and a circumferential outlet (14);
An impeller 20 installed inside the casing and capable of supplying the mud from the inlet to the outlet by rotation;
A rotary shaft (40) rotated by an external driving source and connected to the impeller by a rotary shaft coupling part (22) of the impeller;
A frame (50) which rotatably supports the rotary shaft and is fixed to the casing (10);
And a rotary shaft support portion (34) extending radially inwardly of the frame (50) at a center portion thereof, the rotary shaft support portion (34) being supported between the frame (50) and the casing A stuffing box 30; And
And sealing means provided between the rotary shaft support portion (34) of the stuffing box and the rotary shaft to prevent foreign matter contained in the mud from penetrating into the frame,
A cylindrical sleeve 42 is provided on a rotary shaft corresponding to the inside of the rotary shaft support portion 34 and an inner extended portion 34a extending inwardly in contact with the sleeve 42 is provided on the inner side of the rotary shaft support portion 34, Lt; / RTI >
The sealing means includes a plurality of gland packing (64) installed between the sleeve and the rotary shaft support on the outer side with respect to the inner extension (34a), and a mechanical seal A seal, and a seal ring disposed between the mechanical seal and the inner extension,
A deflector (68) is provided on a rotary shaft corresponding to the inside of the grand cap fastened to the rotary shaft support portion, and a reflecting portion of a concave circular arc-shaped cross section is formed on the outer circumferential portion so as to reflect foreign matter penetrating to the side of the grand cap A packing 68b provided between the deflector 68 and the rotary shaft 40, a packing 62a provided between the sealing ring 62 and the inner circumferential surface of the rotary shaft support 34, a mechanical seal 60 and a sleeve 42, A packing 60a provided between the sleeve 42 and the impeller 22 and a packing 42a provided at a contact portion between the sleeve 42 and the impeller 22,
Wherein the blades of the impeller are formed to be convex and streamlined toward the downstream side in the rotating direction. delete The method according to claim 1,
Wherein the mechanical seal is resiliently supported by the seal ring by a spring provided on the back side of the impeller and the mechanical seal is closely attached to the seal ring by the elastic force of the spring.
The mud pump according to claim 1, wherein the sealing ring is supported on a mechanical seal side by a pin (63) provided on an inner extension portion.
The method according to claim 1,
The grand packing includes an insertion portion (66a) inserted into an end portion of the rotary shaft support portion and a flange portion (66b) contacting the end portion of the rotary shaft support portion, and is supported by a grand cap fastened and fixed to the rotary shaft support portion .






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