CN218624615U

CN218624615U - Power end housing and plunger pump

Info

Publication number: CN218624615U
Application number: CN202221794812.4U
Authority: CN
Inventors: 李晓斌; 崔文平; 魏小淞; 张树林; 郭子蒙; 姜琛
Original assignee: Yantai Jereh Petroleum Equipment and Technologies Co Ltd
Current assignee: Yantai Jereh Petroleum Equipment and Technologies Co Ltd
Priority date: 2022-07-12
Filing date: 2022-07-12
Publication date: 2023-03-14
Anticipated expiration: 2032-07-12

Abstract

The application discloses a power end shell and a plunger pump, wherein the power end shell comprises a crankcase body and a crosshead box body which are fixedly connected in an undetachable mode, the crankcase body is provided with a crankshaft mounting cavity, and the crosshead box body is provided with a crosshead mounting cavity communicated with the crankshaft mounting cavity; the power end shell is provided with a connecting hole, an orifice of the connecting hole is located at the position, away from the end face of the crankcase body, of the crosshead crankcase body, the connecting hole extends towards the direction where the crankcase body is located, the tail end of the connecting hole is provided with an internal thread, the internal thread is used for being in threaded connection with a connecting bolt so as to be connected with the power end shell and a valve box of a hydraulic end, and the distance between the orifice and the internal thread is larger than the inner diameter of the internal thread. The overall rigidity of the crankcase body and the crosshead case body in the power end shell is relatively strong, and the oil leakage phenomenon is not easy to occur at the joint of the crankcase body and the crosshead case body.

Description

Power end housing and plunger pump

Technical Field

The application relates to the technical field of oil and gas exploitation equipment, in particular to a power end shell and a plunger pump.

Background

The plunger pump is an important equipment in the oil and gas exploitation process, and the plunger pump usually includes fluid end and power end, and the power end can pass through speed reduction transmission system etc. with kinetic energy and transmit to the fluid end, and the power that the inside high-pressure liquid of fluid end produced passes through spare parts such as plunger and acts on to the power end casing, and the power end casing usually includes crankcase and cross head box. At present, a crankcase body and a crosshead case body of a power end shell are generally fixedly connected through bolts, so that the overall rigidity of the power end shell formed by the crankcase body and the crosshead case body is relatively poor, and the phenomenon of oil leakage is easily caused at the joint of the crankcase body and the crosshead case body.

SUMMERY OF THE UTILITY MODEL

The application discloses power end casing and plunger pump to the holistic rigidity of crankcase and cross head box in solving present power end casing is relatively poor, and the problem of oil leak phenomenon appears easily in the junction of the two.

In order to solve the above problems, the following technical solutions are adopted in the present application:

in a first aspect, the present application discloses a power end housing comprising a crankcase body and a crosshead case fixedly and non-detachably connected, the crankcase body having a crankshaft mounting cavity and the crosshead case having a crosshead mounting cavity in communication with the crankshaft mounting cavity;

the power end shell is provided with a connecting hole, an orifice of the connecting hole is located at the position, away from the end face of the crankcase body, of the crosshead crankcase body, the connecting hole extends towards the direction where the crankcase body is located, the tail end of the connecting hole is provided with an internal thread, the internal thread is used for being in threaded connection with a connecting bolt so as to be connected with the power end shell and a valve box of a hydraulic end, and the distance between the orifice and the internal thread is larger than the inner diameter of the internal thread.

In a second aspect, the embodiment of the application discloses a plunger pump, it includes bent axle, cross head, connecting bolt, valve box and above-mentioned power end casing, the bent axle install in the bent axle installation cavity of bent axle box, the cross head install in the cross head installation cavity of cross head box, the cross head is connected with the crankshaft transmission, the valve box with power end casing is through stretching into the connecting hole, and with internal thread threaded connection's connecting bolt fixed connection.

The technical scheme adopted by the application can achieve the following beneficial effects:

the embodiment of the application discloses power end casing, this power end casing can be used in equipment such as plunger pump, and with the valve case fixed connection of the hydraulic end of equipment such as plunger pump. The power end casing includes the crankcase body that is used for holding the bent axle and the cross head box body that is used for holding the cross head, and through making crankcase body and cross head box body form non-detachably fixed connection relation, it is higher relatively to guarantee the connection reliability between crankcase body and the cross head box body, and then make the bulk rigidity of power end casing better, and, because adopt non-detachable mode fixed connection between crankcase body and the cross head box body, make to form inseparable connection relation more easily between the two, this can prevent to appear the oil leak phenomenon because of there being the gap between the two.

In the power end housing, the connection hole of the power end housing is connected to the connection bolt via an internal thread, so that the power end housing can be stably and fixedly connected to the valve housing. Simultaneously, the interval between the drill way of connecting hole and the terminal internal thread of connecting hole is greater than the internal diameter of internal thread for connecting bolt can stretch into to the depths of power end casing, and then guarantees that connecting bolt is great relatively at the distance between the effect point on power end casing and the valve case, promotes the assembly stability between power end casing and the connecting bolt.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a schematic structural diagram of a power end housing disclosed in an embodiment of the present application;

FIG. 2 isbase:Sub>A schematic cross-sectional view of the structure shown in FIG. 1, taken along A-A;

FIG. 3 is a schematic cross-sectional view of the structure shown in FIG. 1 in the direction B-B;

FIG. 4 is a schematic diagram of a partial structure of a plunger pump disclosed in an embodiment of the present application;

fig. 5 is a schematic cross-sectional view of the structure shown in fig. 4 in the direction C-C.

Description of the reference numerals:

100-power end housing, 110-crankcase, 120-crosshead case, 130-connecting hole, 140-internal thread,

200-valve box,

310-connecting bolt, 320-connecting nut,

400-spacing frame.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

Technical solutions disclosed in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

As shown in fig. 1 to 5, the embodiment of the present application discloses a power end housing 100, the power end housing 100 may be applied to a plunger pump to provide an installation space for a crankshaft and a crosshead (not shown) in the plunger pump, and the power end housing 100 may serve as a medium for mutually fixing a power end and a fluid end of the plunger pump. Specifically, in the process of assembling the plunger pump, the power end casing 100 and the valve box 200 of the hydraulic end can be fixedly connected through bolts and other connecting members to form a good relative fixing relationship between the power end and the hydraulic end, so that the plunger pump can stably work.

As shown in fig. 2, the power end housing 100 disclosed in the embodiment of the present application includes a crankcase body 110 and a crosshead case body 120, and the crankcase body 110 and the crosshead case body 120 are non-detachably fixedly coupled; meanwhile, in order that the power end housing 100 may provide a mounting space for the crankshaft and the crosshead, the crankcase body 110 has a crankshaft mounting cavity, the crosshead case body 120 has a crosshead mounting cavity, and the crankshaft and the crosshead ensuring the driving connection may be mounted in the crankshaft mounting cavity and the crosshead mounting cavity, respectively, by making the crankshaft mounting cavity and the crosshead mounting cavity communicate with each other.

Specifically, the power end housing 100 may be formed of a relatively strong material such as metal, for example, the power end housing 100 may be formed in an integral manner such that the crankcase body 110 and the crosshead case body 120 in the power end housing 100 are in an unreleasably fixed connection. Further, a crankshaft mounting cavity and a crosshead mounting cavity may be formed in the crankcase body 110 and the crosshead case body 120, respectively, by means of drilling, etc., and the shape, size, etc. of both may be set according to the crankshaft and the crosshead to be mounted, which is not limited herein.

In the present application, as shown in fig. 2, the crankcase 110 and the crosshead case 120 of the power end housing 100 are substantially distributed in the left-right direction, and when they are integrally formed, they have no distinct limitations in terms of specific structures, but because of differences in their functions, in order to facilitate the distinction between different portions of the power end housing 100, the portion of the power end housing 100 to which the crankshaft is attached is designated as the crankcase 110, and the portion of the power end housing 100 to which the crosshead is attached is designated as the crosshead case 120.

Meanwhile, in order to ensure that the power end housing 100 can be reliably and fixedly connected with the valve housing 200 of the fluid end, as shown in fig. 1 and 3, the power end housing 100 is further provided with a connecting hole 130, an opening of the connecting hole 130 is located at an end surface of the crosshead case body 120 facing away from the crankcase body 110, and the connecting hole 130 extends in a direction close to the crankcase body 110. That is, the connection hole 130 is formed by being recessed from an end surface of the power end housing 100 closest to the valve housing 200 toward the other end surface, so that the connection bolt 310 can extend into the connection hole 130 from the opening of the connection hole 130 during the process of assembling the power end housing 100 and the valve housing 200, and the connection hole 130 is used to provide an escape space for the connection bolt 310 to continuously extend into the power end housing 100. Specifically, the connection holes 130 may be formed together by providing corresponding molds during the process of integrally molding the power end housing 100, and the connection holes 130 may have a certain depth.

Accordingly, in order to ensure that the connection hole 130 can be connected to the connection bolt 310, the end of the connection hole 130 may be provided with an internal thread 140, so that the connection hole 130 (or the power end housing 100) can be threadedly connected to the connection bolt 310 using the internal thread 140, and thus the power end can be interconnected to the valve housing 200 of the fluid end. Specifically, the internal thread 140 may be formed in the connecting hole 130 of the power end housing 100 by machining or the like, and the end of the connecting hole 130 is the end of the connecting hole 130 away from the aperture. In the case where the internal thread 140 is formed at the end of the connection hole 130, the connection reliability between the connection bolt 310 and the connection hole 130 is made relatively higher. The relevant parameters of the internal thread 140 may be determined according to the corresponding size of the connection bolt 310, and are not limited herein.

As described above, in the process of assembling the power end housing 100, the power end housing 100 and the valve box 200 of the fluid end need to be fixed to each other, and since frequent force transmission exists between the power end and the fluid end during the operation of the plunger pump, in order to improve the stability of the force applied by the fluid end to the power end, the distance between the opening of the connection hole 130 and the internal thread 140 in the connection hole 130 may be greater than the inner diameter of the internal thread 140, in this case, the size of the connection bolt 310 that can be inserted into the connection hole 130 is relatively larger, so as to improve the connection reliability between the connection bolt 310 and the connection hole 130, and the point of application of the connection bolt 310 on the power end housing 100 is closer to the center of the power end housing 100, thereby ensuring higher connection stability between the valve box 200 of the fluid end and the power end housing 100.

The embodiment of the application discloses a power end housing 100, and the power end housing 100 can be applied to equipment such as a plunger pump and is fixedly connected with a valve box 200 at a hydraulic end of the equipment such as the plunger pump. The power end housing 100 comprises a crankcase body 110 for containing a crankshaft and a crosshead case body 120 for containing a crosshead, and the crankcase body 110 and the crosshead case body 120 are in an undetachable fixed connection relationship, so that the connection reliability between the crankcase body 110 and the crosshead case body 120 is relatively high, the overall rigidity of the power end housing 100 is good, and the power end housing 110 and the crosshead case body 120 are fixedly connected in an undetachable mode, so that a tight connection relationship is easily formed between the crankcase body 110 and the crosshead case body 120, and oil leakage between the crankcase body and the crosshead case body due to gaps can be prevented.

Also, in the above power end housing 100, the connection hole 130 of the power end housing 100 itself is connected to the connection bolt 310 by the female screw 140 so that the power end housing 100 can be stably and fixedly connected to the valve housing 200. Meanwhile, the distance between the orifice of the connecting hole 130 and the internal thread 140 at the tail end of the connecting hole 130 is larger than the inner diameter of the internal thread 140, so that the connecting bolt 310 can extend into the power end housing 100 to a deep position, the distance between the acting point of the connecting bolt 310 on the power end housing 100 and the valve box 200 is relatively large, and the assembling stability between the power end housing 100 and the connecting bolt 310 is improved.

Further, as shown in fig. 1, the connection hole 130 may be extended from an end of the crosshead case body 120 facing away from the crankcase body 110 to a side of the crosshead case body 120 facing the crankcase body 110. In other words, the end of the connection hole 130 may be located on the portion of the power end housing 100 where the crankcase body 110 is located, in which case the depth of the connection hole 130 may be further increased, and when the connection bolt 310 is connected to the connection hole 130, the point of action of the connection bolt 310 is located on the crankcase body 110, the distance between the point of action of the connection bolt 310 and the valve housing 200 is relatively larger, and the position on the power end housing 100 is relatively more centered, further improving the stability of the effect of the connection bolt 310.

Alternatively, the connection hole 130 may extend to a position in the crankcase body 110 farther from the crosshead case body 120, and with reference to a bearing seat inner hole on the crankcase body 110, the connection hole 130 may extend to a side of the bearing seat inner hole in the crankcase body 110 facing away from the crosshead case body 120, or the connection hole 130 may extend to a region in the crankcase body 110 where the bearing seat inner hole is located.

In another embodiment of the present application, in order to make the overall size of the power end housing 100 relatively small, as shown in fig. 3, the end of the coupling hole 130 may be located on a portion of the bearing housing inner hole of the crankcase body 110 near the crosshead case body 120, in which case the position of the largest dimension in the crankcase body 110 may be determined according to the size of the bearing housing inner hole without reserving a corresponding size for the layout of the coupling hole 130. Moreover, in the case of the technical solution disclosed in the present embodiment, the end of the connecting hole 130 may be substantially located in the area between the crankcase 110 and the crosshead case 120, so that the acting point of the connecting bolt 310 is located more centrally on the power end housing 100, which may further improve the stability of the acting effect between the connecting bolt 310 and the power end housing 100.

As described above, the crankcase body 110 and the crosshead case body 120 may be integrally formed, and in view of the relatively complicated structure of the crankcase body 110, particularly the crosshead case body 120, in another embodiment of the present application, in order to reduce the difficulty of integrally processing the crankcase body 110 and the crosshead case body 120, optionally, the crankcase body 110 and the crosshead case body 120 are separately formed and are non-detachably and fixedly connected by welding. In this case, the crankcase body 110 and the crosshead body 120 may be separately formed and then fixedly coupled by welding after being separately formed to form the entire power end housing 100, so that the difficulty of processing the entire power end housing 100 may be reduced. The crankcase body 110 and the crosshead body 120 may be formed by casting, etc., and a crankshaft mounting cavity and a crosshead mounting cavity may be formed on the crankcase body 110 and the crosshead body by drilling, etc., respectively, and accordingly, the connecting hole 130 may also be formed on the crosshead body 120 (and the crankcase body 110) by drilling, integral casting, etc.

In another embodiment of the present application, the crosshead case 120 includes a plurality of welded and fixed plate materials, that is, the crosshead case 120 may be formed by welding and fixing a plurality of plate materials, in which case, the difficulty of machining the relatively complicated structure of the crosshead case 120 may be further reduced, and the machining accuracy of the crosshead case 120 may be improved. Accordingly, after the crosshead case 120 is welded and formed by a plurality of plates, the crosshead case 120 and the crankcase 110 may be integrally connected by welding, and a tight weld may be formed therebetween to prevent oil leakage at the joint between the crosshead case and the crankcase.

In addition, in the case that the crosshead case 120 is formed by welding a plurality of plate materials, the end of the connecting hole 130 may be extended to the region where the crankcase body 110 is located, and the acting position of the connecting bolt 310 may be located at the region where the crankcase body 110 is located, thereby preventing the acting force of the connecting bolt 310 from acting on the crosshead case 120 as much as possible, preventing the weld on the crosshead case 120 from being cracked due to a long-term stress, and improving the structural stability and the lifespan of the crosshead case 120.

As described above, the connection hole 130 may be formed in the forming process of the power end housing 100, and in another embodiment of the present application, optionally, the connection hole 130 is formed by drilling, which may reduce the difficulty in forming the connection hole 130, and may improve the machining precision of the connection hole 130, and may further improve the connection reliability between the connection hole 130 and the connection bolt 310, so that the connection stability between the power end housing 100 and the valve box 200 of the hydraulic end is higher. Specifically, after the crankcase 200 and the crosshead case 200 are machined and form a stable fixed connection relationship, the connection hole 130 may be machined on the power end housing 100 by means of drilling.

In order to further improve the processing convenience of the connecting hole 130, optionally, a chip blowing hole is further disposed on the power end housing 100 disclosed in the embodiment of the present application, one end of the chip blowing hole is connected to the end of the connecting hole 130, and the other end of the chip blowing hole is communicated with the inner cavity of the power end housing 100, so that in the process of expanding the connecting hole 130, high-speed gas is introduced through the chip blowing hole, the processing chips in the connecting hole 130 are blown out of the connecting hole 130, and the processing difficulty of the connecting hole 130 is reduced. Specifically, a hole with a relatively small diameter may be formed at the position of the connection hole 130 in advance, and a chip blowing hole may be formed at the end of the hole, and then, in the process of further enlarging the diameter of the hole to form the required connection hole 130, high-speed gas may be introduced through the chip blowing hole, so as to reduce the difficulty in forming the connection hole 130.

In the process of assembling the power end housing 100, a plurality of connecting bolts 310 are generally required to be installed on the power end housing 100 and the valve box 200 together to ensure a reliable connection relationship therebetween, for this reason, a plurality of connecting holes 130 are provided on the power end housing 100, the ends of the plurality of connecting holes 130 are provided with internal threads 140, and the plurality of connecting holes 130 are provided with the connecting bolts 310 in a one-to-one correspondence to provide a locking force through the plurality of connecting bolts 310 and the connecting holes 130 which are engaged with each other.

Based on the above technical solution, as shown in fig. 3, in the process of arranging the plurality of coupling holes 130, the ends of the plurality of coupling holes 130 may be flush with each other in the axial direction of the coupling holes 130, that is, the depths of the plurality of coupling holes 130 formed to extend inward from the end surface of the crosshead case body 120 facing away from the crankcase body 110 may be equal or substantially equal. With this technical solution, in the process of connecting with the connecting bolt 310 respectively by using the plurality of connecting holes 130, the relative positions of the respective points of action of the plurality of connecting bolts 310 on the power end housing 100 are made to be the same or substantially the same, which may further improve the stability of the connection between the connecting bolt 310 and the power end housing 100.

In the power end casing 100 disclosed in the embodiment of the present application, as shown in fig. 1, the both sides that are opposite to each other of cross head installation cavity may be symmetrically provided with at least one connecting hole 130, that is, the both sides that are opposite to each other of cross head installation cavity are provided with at least one connecting hole 130, and are respectively located the connecting holes 130 that are opposite to each other of cross head, which makes the positions of the action points of the plurality of connecting bolts 310 on the power end casing 100 more balanced, makes the uniformity of the action force that the power end casing 100 receives better relatively, and improves the structural strength and the service life of the power end casing 100.

Based on the power end housing 100 disclosed in any of the above embodiments, as shown in fig. 4 and 5, the present embodiment further discloses a plunger pump, which includes a crankshaft, a crosshead, a connecting bolt 310, a valve housing 200 and the power end housing 100 disclosed in any of the above embodiments, and of course, the plunger pump further includes other structures such as a spacer 400 disposed between the power end housing 100 and the valve housing 200, and for brevity, the structures are not described again.

Wherein, the crankshaft is arranged in the crankshaft mounting cavity of the crankcase body 110, the crosshead is arranged in the crosshead mounting cavity of the crosshead case body 120, and the crosshead is in transmission connection with the crankshaft. Meanwhile, the valve box 200 and the power end housing 100 are fixedly connected through the connecting bolt 310 which extends into the connecting hole 130 and is in threaded connection with the internal thread 140, so that the valve box 200 and the power end housing 100 form a fixed relation, optionally, one end of the valve box 200, which deviates from the power end housing 100, can be provided with the connecting nut 320, the connecting nut 320 can be embedded in the valve box 200, and through one end of the connecting nut 320 and the connecting bolt 310, which deviates from the power end housing 100, is in threaded connection, so that a stable fixed connection relation can be formed between the valve box 200 and the power end housing 100. Furthermore, a plurality of connection holes 130 may be formed in the power end housing 100, and by providing connection bolts 310 in one-to-one correspondence with the plurality of connection holes 130, it is ensured that high assembly stability is formed between the valve housing 200 and the power end housing 100.

In the embodiments of the present application, the difference between the embodiments is described in detail, and different optimization features between the embodiments can be combined to form a better embodiment as long as the differences are not contradictory, and further description is omitted here in view of brevity of the text.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art to which the present application pertains. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A power end housing, comprising a crankcase (110) and a crosshead case (120) that are non-detachably fixedly connected, the crankcase (110) having a crankshaft mounting cavity, the crosshead case (120) having a crosshead mounting cavity that communicates with the crankshaft mounting cavity;

the power end shell is provided with a connecting hole (130), an orifice of the connecting hole (130) is located on the end face, away from the crankcase body (110), of the crosshead case body (120), the connecting hole (130) extends towards the direction close to the crankcase body (110), the tail end of the connecting hole (130) is provided with internal threads (140), the internal threads (140) are used for being in threaded connection with a connecting bolt (310) to connect the power end shell with a valve box (200) of a hydraulic end, and the distance between the orifice and the internal threads (140) is larger than the inner diameter of the internal threads (140);

the crankshaft box body (110) and the crosshead box body (120) are formed in a split mode and are fixedly connected in an undetachable mode in a welding mode, and a tight welding seam is formed between the crankshaft box body (110) and the crosshead box body (120).

2. The power end housing according to claim 1, wherein the coupling bore (130) extends from an end of the crosshead case body (120) facing away from the crankcase body (110) to a side of the crosshead case body (120) facing the crankcase body (110).

3. The power end housing of claim 2, wherein the attachment bore (130) terminates at a portion of the bearing housing bore on the crankcase body (110) proximate to the crosshead case body (120).

4. The power end housing of claim 1, wherein the crosshead case (120) comprises a plurality of weld-secured sheet materials.

5. The power end housing of claim 1, wherein the attachment bore (130) is formed by way of a drilling process.

6. The power end housing according to claim 5, wherein the power end housing is provided with a chip blowing hole, one end of the chip blowing hole is connected to the end of the connecting hole (130), and the other end of the chip blowing hole is communicated with the inner cavity of the power end housing.

7. The power end housing of claim 1, wherein the power end housing is provided with a plurality of the connection holes (130), and the ends of the plurality of connection holes (130) are flush on the axis of the connection holes (130).

8. The power end housing of claim 1, wherein the crosshead mounting cavity is symmetrically provided with at least one connecting hole (130) on opposite sides thereof.

9. A plunger pump, characterized by comprising a crankshaft, a crosshead, a connecting bolt (310), a valve box (200) and the power end housing (100) of any one of claims 1-8, wherein the crankshaft is mounted in a crankshaft mounting cavity of the crankcase body (110), the crosshead is mounted in a crosshead mounting cavity of the crosshead case body (120), the crosshead is in transmission connection with the crankshaft, and the valve box (200) and the power end housing (100) are fixedly connected through the connecting bolt (310) extending into the connecting hole (130) and in threaded connection with the internal thread (140).