CN111609235A

CN111609235A - Switching seal structure and fracturing pump

Info

Publication number: CN111609235A
Application number: CN202010622398.8A
Authority: CN
Inventors: 刘小鹏; 赵洪波; 刘旭升
Original assignee: Sany Petroleum Intelligent Equipment Co Ltd
Current assignee: Sany Petroleum Intelligent Equipment Co Ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2020-09-01

Abstract

The invention relates to the field of fracturing pump accessories, in particular to a switching sealing structure and a fracturing pump. The switching sealing structure comprises an external connector, a rotary connector and a gland; a sealing cavity is arranged at one side of the gland, and the rotary joint is arranged in the sealing cavity; the gland is provided with a connecting hole which is communicated with the sealing cavity; the external joint is communicated with the rotary joint through the connecting hole, and the rotary joint is rotatably connected with the external joint; and a sealing device is arranged on the side wall of the connecting hole and is used for sealing and separating two sides of the gland. The invention realizes the change from the driven seal to the static seal, so that the sealing device can not be damaged when the rotary joint rotates, and the sealing performance is ensured.

Description

Switching seal structure and fracturing pump

Technical Field

The invention relates to the field of fracturing pump accessories, in particular to a switching sealing structure and a fracturing pump.

Background

In the conventional hydraulic fracturing pump, the crankshaft rotates relative to the housing, which causes large friction, and therefore, the crankshaft needs to be lubricated. In the existing lubricating scheme, lubricating oil is connected from the shaft end of the crankshaft. And on the position of crankshaft lubrication joint, use rotary joint to add the crossover sub and connect, rotary joint follows the crankshaft rotation, and the oil pipe is failed in crossover sub connection, does not rotate, and then realizes rotating to static conversion, adopts rotatory oil blanket to realize sealing between crossover sub and rotary joint.

In the prior art, the rotary oil seal takes a rubber piece as a sealing piece, and after continuous rotation operation, the sealing piece is damaged due to friction, so that the sealing is damaged, oil leakage is generated, and the rotary oil seal becomes a failure point.

Disclosure of Invention

The invention aims to provide a switching sealing structure and a fracturing pump, which can change a sealing position from a driven seal to a static seal, so that a sealing device cannot be damaged when a rotary joint rotates, and the sealing performance is ensured.

The technical scheme of the invention is as follows:

a switching seal structure comprises a transition joint, a rotary joint and a gland;

a sealing cavity is formed in one side of the gland, and the rotary joint is arranged in the sealing cavity;

the gland is provided with a connecting hole which is communicated with the sealing cavity;

at least part of the transition joint is arranged in the connecting hole and is rotatably connected with one end of the transition joint of the rotating joint;

and a sealing device is arranged on the side wall of the connecting hole and is used for sealing and separating two sides of the gland.

Preferably, one end of the transition joint, which is far away from the rotary joint, is provided with an external joint.

Preferably, a positioning structure is arranged on the transition joint;

the locating structure is used for preventing the transition joint from being separated from the gland in the operation process.

Preferably, the positioning structure is a positioning ring, and the positioning ring is arranged on the outer wall of the end of the transition joint connected with the rotating joint.

Preferably, the adapter sealing structure further comprises a fixing sleeve, and the fixing sleeve is used for fixedly arranging the rotary joint on the crankshaft.

Preferably, the rotary joint comprises a positioning part, a first connecting part and a second connecting part;

the first connecting part and the second connecting part are respectively arranged at two opposite ends of the positioning part;

the rotary joint is provided with an oil conveying hole, and the oil conveying hole penetrates through the first connecting portion, the positioning portion and the second connecting portion in sequence.

Preferably, a sealing groove is formed in the side wall of the connecting hole, and the sealing device is arranged in the sealing groove.

Preferably, one side of the gland is provided with a containing groove, the connecting hole is arranged at the bottom of the containing groove, and one end of the rotary joint is arranged in the containing groove.

Preferably, the sealing device is a sealing ring.

A fracturing pump comprising a pump body and the transition seal structure of any one of the above;

the rotary joint is arranged on a crankshaft of the pump body and is communicated with an oil way in the crankshaft, and the gland is arranged on an end cover of the pump body.

The invention has the beneficial effects that:

connect external oil circuit and rotary joint through transition joint, rotary joint connects the bent axle, and rotary joint sets up in the sealed intracavity of gland, and sealing device sets up on the lateral wall of the connecting hole of gland, and then has realized that driven seal becomes static seal for sealing device can not cause the destruction when rotary joint's rotation, has guaranteed sealing performance.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of an adapter seal structure provided in an embodiment of the present invention;

fig. 2 is another structural schematic diagram of an adapter seal structure according to an embodiment of the present invention.

In the figure:

1: a transition joint; 2: a seal ring; 3: a gland; 4: an end cap; 5: fixing a sleeve; 6: a rotary joint; 7: a crankshaft.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the present invention will be described in detail below with reference to fig. 1 and 2. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

A switching sealing structure comprises a transition joint 1, a rotary joint 6 and a gland 3; a sealing cavity is arranged at one side of the gland 3, and the rotary joint 6 is arranged in the sealing cavity; a connecting hole is formed in the gland 3 and is communicated with the sealing cavity; at least part of the transition joint 1 is arranged in the connecting hole, and the transition joint 1 is connected with the rotary joint 6 in a rotatable manner; and a sealing device is arranged on the side wall of the connecting hole and is used for sealing and separating two sides of the gland 3.

In this embodiment, gland 3 is fixed to be set up on end cover 4 of force pump, and rotary joint 6 is fixed to be set up on the crank, and sets up in gland 3, and rotary joint 6 is connected with transition joint 1 through the connecting hole on gland 3, sets up sealing device on the lateral wall of connecting hole, seals the both ends of connecting hole and separates, and then realizes the inside and outside sealed of gland 3, avoids lubricated liquid to flow out from gland 3.

Specifically, in this embodiment, the fixed connection between the gland 3 and the end cover 4 is a bolt connection, that is, the gland 3 is provided with a plurality of through holes, the end cover 4 is provided with a plurality of threaded holes, and after the bolt passes through the through hole, the bolt is in threaded connection with the threaded hole in the end cover 4, so as to fix the gland 3 on the end cover 4. Such setting for gland 3 can also be dismantled, when the condition such as damaged appears in gland 3, is convenient for change gland 3, or breaks down when inside spare parts such as transition joint 1, rotary joint 6, when needing to overhaul, can also only open gland 3 and can carry out corresponding operation, need not open end cover 4 for operation convenience more.

Concretely, at bent axle 7 pivoted in-process, rotary joint 6 follows bent axle 7 and rotates, end cover 4 is on the pump body, do not rotate, gland 3 is fixed on end cover 4, also can not rotate,

transition joint

1 and 6 rotatable coupling of rotary joint, rotary joint 6 rotates promptly, transition joint 1 does not rotate, at this moment, sealing device between gland 3 and the transition joint 1 can not receive any rotational friction, that is to say, sealing device at this moment is quiet sealed, and seal through the assembly between rotary joint 6 and the transition joint 1, at the pivoted in-process, produce the clearance and after the oil leak, also can not follow gland 3 and flow out, and then guaranteed the holistic sealing performance of fracturing pump.

Preferably, the end of the transition joint 1 remote from the rotary joint 6 is provided with an external joint.

Specifically, in this embodiment, as shown in fig. 1, the transition joint 1 is disposed through the connecting hole, and two ends of the transition joint extend out from two ends of the connecting hole, and two ends of the transition joint 1 are connected to the external joint and the rotary joint 6, respectively, that is, the rotary joint 6 is inside the gland 3, and the external joint is outside the gland 3.

More specifically, in the present embodiment, the two ends of the transition joint 1 are respectively provided with a connecting groove, and the external joint and the rotary joint 6 are respectively inserted into the two connecting grooves, so that the pipes in the external joint, the transition joint 1 and the rotary joint 6 are communicated to form a lubricating fluid passage.

In this embodiment, be equipped with the internal thread in the spread groove of the outer end of transition joint 1, carry out threaded connection with external joint, the spread groove of the inner of transition joint 1 is the bell jar, and its notch diameter is greater than the tank bottom diameter, and the mounting connection of rotary joint 6 of both being convenient for can increase the area of contact between rotary joint 6 and the transition joint 1 again, and then increases the sealed effect between rotary joint 6 and the transition joint 1.

It should be noted that the connection mode between the transition joint 1 and the external joint is not limited to the threaded connection, and the connection mode between the transition joint 1 and the rotary joint 6 is not limited to the above connection mode, as long as the transition joint 1 and the external joint can be fixedly connected, and the transition joint 1 and the rotary joint 6 can be rotatably connected.

Specifically, in another embodiment of the invention, as shown in fig. 2, one end of the transition joint 1 is in the connecting hole, the other end is connected with the rotary joint 6, and the external joint is inserted into the connecting hole of the gland 3, and is communicated with the transition joint 1 through the connecting hole, and further communicated with the rotary joint 6.

Preferably, the transition joint 1 is provided with a positioning structure; the locating structure is used to prevent the transition joint 1 from disengaging from the gland 3 during operation.

Because the transition joint 1 is arranged in the connecting hole, the transition joint needs to be axially positioned so as to ensure that the transition joint cannot be separated from the gland 3 in the working process.

Specifically, in the present embodiment, the positioning structure is disposed at one end of the transition joint 1 and inside the gland 3.

Specifically, in the present embodiment, the positioning structure is a positioning ring, and the positioning ring is disposed on the outer wall of the end of the transition joint 1 connected to the rotary joint 6.

Specifically, in the present embodiment, the positioning ring is fixedly disposed at the inner end of the transition joint 1, and more specifically, the positioning ring is integrally disposed with the transition joint 1.

In this embodiment, the outer diameter of the positioning ring is greater than the diameter of the connection hole, so that when the transition joint 1 is installed, after the connection hole is inserted from the inner side of the gland 3, the positioning ring abuts against the inner side surface of the gland 3, the positioning of the transition joint 1 on the gland 3 is realized, and when the transition joint 1 moves towards the inner side of the gland 3, the transition joint 1 abuts against the rotary joint 6, and a complete positioning function is formed.

It should be noted that, in the present embodiment, the positioning structure is a positioning ring, but it is not limited to a positioning ring, and it may also be other shape structures, such as several positioning blocks that are uniformly arranged, etc., as long as it can achieve the axial positioning function of the transition joint 1.

Preferably, the adapter seal structure further comprises a fixing sleeve 5, and the fixing sleeve 5 is used for fixedly arranging the rotary joint 6 on the crankshaft 7.

In this embodiment, the shape of the fixed sleeve 5 is a tube shape, one end of the tube shape is provided with an inner baffle, the other end is provided with an outer baffle, the rotary joint 6 is arranged inside the fixed sleeve 5, the rotary joint 6 is axially positioned through the inner baffle, and the fixed sleeve 5 is fixed on the crankshaft 7 through the outer baffle.

Specifically, in this embodiment, the inner baffle and the outer baffle are both annular.

Annular structure, when can making interior baffle and rotary joint 6 carry out the butt, it is relatively more steady, and in the same way, when can making outer baffle and bent axle 7 carry out fixed connection, stability and equilibrium improve.

More specifically, in this embodiment, a plurality of fixing holes are provided on the outer baffle, a threaded hole is correspondingly provided on the crankshaft 7, and after the fixing bolt passes through the fixing hole, the fixing bolt is in threaded connection with the threaded hole on the crankshaft 7, so as to fix the fixing sleeve 5 on the crankshaft 7, and further, the axial positioning of the rotary joint 6 is realized.

Preferably, the rotary joint 6 includes a positioning portion, a first connecting portion, and a second connecting portion; the first connecting part and the second connecting part are respectively arranged at two opposite ends of the positioning part; the rotary joint 6 is provided with an oil conveying hole which sequentially penetrates through the first connecting part, the positioning part and the second connecting part.

In this embodiment, in order to facilitate positioning and fixing the rotary joint 6, in this embodiment, the rotary joint 6 is divided into three parts, a middle part is a positioning part with a relatively large diameter, and two ends of the positioning part are respectively a first connecting part connected with the transition joint 1 and a second connecting part connected with the crankshaft 7.

Specifically, the second connecting part connected with the crankshaft 7 is inserted into a connecting groove of the crankshaft 7, and an oil delivery hole inside the second connecting part is communicated with an oil delivery hole of the crankshaft 7; the first connection portion connected with the transition joint 1 is conical in shape, is inserted into the conical groove of the transition joint 1, and is matched with the conical groove to realize conical sealing between the transition joint 1 and the rotary joint 6.

In order to ensure the sealing effect between the transition joint 1 and the gland 3 and realize the positioning of the sealing device, a sealing groove is arranged on the side wall of the connecting hole, the sealing groove is annularly arranged, and the sealing device arranged in the sealing groove can fully seal the circumferential direction of the transition joint 1.

In the present embodiment, the cross-sectional shape of the seal groove is rectangular.

Preferably, one side of the gland 3 is provided with a containing groove, the connecting hole is arranged at the bottom of the containing groove, and one end of the rotary joint 6 is arranged in the containing groove.

Specifically, in this embodiment, the inner side of the gland 3 is provided with a containing groove, and the containing groove is provided with a secondary stepped groove, wherein the bottom of the groove with a larger diameter is correspondingly provided with or abutted against the outer end of the fixed sleeve 5, the first connecting part connected with the transition joint 1 on the rotary joint 6 is inserted into the groove with a smaller diameter, and meanwhile, the outer baffle of the transition joint 1 is also provided in the stepped groove with a smaller diameter.

With the arrangement, the pressure plate can seal and protect the rotary joint 6, and the outer side of the gland 3 can be adjusted according to the shape of the inner side containing groove, so that the appearance volume of the gland 3 is reduced, and the quality and the cost are reduced.

Preferably, the sealing means is a sealing ring 2.

The outside setting of sealing washer 2 is in sealed recess, and inboard and transition joint 1's lateral wall looks butt realizes the sealed between gland 3 and the transition joint 1.

A fracturing pump comprising a pump body and the transition seal structure of any one of the above; the rotary joint 6 is arranged on a crankshaft 7 of the pump body and is communicated with an oil way in the crankshaft 7, and the gland 3 is arranged on an end cover 4 of the pump body.

The invention has the beneficial effects that:

connect external oil circuit and rotary joint 6 through transition joint 1, rotary joint 6 connects bent axle 7, and rotary joint 6 sets up in the sealed intracavity of gland 3, and sealing device sets up on the lateral wall of the connecting hole of gland 3, and then has realized that driven seal becomes static seal for sealing device can not cause the destruction when rotary joint 6's rotation, has guaranteed sealing performance.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A switching sealing structure is characterized by comprising a transition joint, a rotary joint and a gland;

at least part of the transition joint is arranged in the connecting hole, and one end of the transition joint is rotatably connected with the rotating joint;

2. The transition seal configuration of claim 1, wherein an end of the transition joint distal from the swivel joint is provided with an external joint.

3. The transition seal structure of claim 1, wherein a locating structure is provided on the transition joint;

4. The transition seal configuration of claim 3, wherein said positioning structure is a positioning ring disposed on an outer wall of an end of said transition joint connected to said swivel.

5. The transition seal structure of claim 1, further comprising a retaining sleeve for fixedly positioning said rotary union on a crankshaft.

6. The transition sealing structure of claim 1, wherein the rotary joint comprises a positioning portion, a first connecting portion and a second connecting portion,

7. The transition sealing structure according to claim 1, wherein a sealing groove is provided on a sidewall of the connection hole, and the sealing means is disposed in the sealing groove.

8. The transition sealing structure according to claim 1, wherein a groove is formed at one side of the gland, the connection hole is formed at a bottom of the groove, and one end of the rotary joint is disposed in the groove.

9. The transition seal configuration of claim 1, wherein said seal is a gasket.

10. A fracturing pump comprising a pump body and a transition seal structure according to any one of claims 1 to 9;