Driving device for hydraulic end of petroleum equipment

Abstract

The application discloses a driving device for a hydraulic end of a petroleum equipment, which comprises a hollow shell body, a movable block, a transmission assembly and a driving unit, the movable block is slidably connected with the shell body, and piston rods matched with the inner cavity of the hydraulic end are fixedly connected with two ends of the movable block; the transmission assembly comprises a driving wheel, a first driven wheel and a second driven wheel, the outer periphery of the driving wheel comprises an engaging section and a non-engaging section, when the engaging section of the driving wheel is engaged with the first driven wheel, the non-engaging section of the driving wheel faces the second driven wheel, and the first driven wheel drives the movable block to slide in a first direction, when the engaging section of the driving wheel is engaged with the second driven wheel, the non-engaging section of the driving wheel faces the first driven wheel, and the second driven wheel drives the movable block to slide in a second direction opposite to the first direction. The driving device has the advantages of reasonable structure, small size, low manufacturing and maintenance cost and good output pressure stability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of petroleum equipment, in particular to a driving device for a hydraulic end of a petroleum equipment. BACKGROUND

[0002] In the operation of modern rotary drilling method for drilling oil and gas wells, mud pumps and other equipment are used as drilling fluid (mud) pressurizing equipment, and the maximum working pressure can reach 52 MPa, so that high-pressure mud is injected into the oil and gas layer in the ground, thereby exploiting the oil and gas in the ground.

[0003] At present, most of the driving of the hydraulic end is the traditional crankshaft- connecting rod, crosshead-guide plate driving type Figure 1 This structure is complex and large in size, and is relatively crowded in a small operation space. In addition, since the crank of the crosshead driven by the crankshaft connecting rod mechanism is not uniform speed movement, a large pressure fluctuation will be generated. Therefore, the current mud pump is basically a three-cylinder or five-cylinder pump, which reduces the discharge pressure fluctuation, and a discharge accumulator is further needed to stabilize the discharge pressure. SUMMARY

[0004] The present application discloses a driving device for a hydraulic end of a petroleum equipment, which solves the technical problems of complex structure, high production and maintenance cost, and large output pressure fluctuation of the driving system of the hydraulic end in the prior art, and has the technical effects of reasonable structure, small size, low manufacturing and maintenance cost, and good stability of output pressure. The technical scheme adopted is as follows:

[0005] A driving device for a hydraulic end of a petroleum equipment, comprising a hollow shell body, a movable block, a transmission assembly and a driving unit, the movable block is arranged in the shell body and is slidably connected with the shell body, both ends of the movable block are fixedly connected with piston rods matched with the hydraulic end, the transmission assembly comprises a driving wheel, a first driven wheel and a second driven wheel, the first driven wheel and the second driven wheel are separately arranged on both sides of the driving wheel and can be engaged, the driving unit can transmit rotary motion to the driving wheel, the outer periphery of the driving wheel comprises an engagement section and a non-engagement section, when the engagement section of the driving wheel is engaged with the first driven wheel, the non-engagement section of the driving wheel faces the second driven wheel, and the first driven wheel drives the movable block to slide in a first direction, when the engagement section of the driving wheel is engaged with the second driven wheel, the non-engagement section of the driving wheel faces the first driven wheel, and the second driven wheel drives the movable block to slide in a second direction opposite to the first direction.

[0006] On the basis of the above technical scheme, the transmission assembly further comprises a first engaging portion and a second engaging portion, the first engaging portion is fixedly arranged in the movable block and corresponds to the position of the first driven wheel, the first driven wheel drives the movable block to slide in the first direction through the first engaging portion, the second engaging portion is fixedly arranged in the movable block and corresponds to the position of the second driven wheel, and the second driven wheel drives the movable block to slide in the second direction through the second engaging portion.

[0007] On the basis of the above technical scheme, the driving wheel is an incomplete gear, and the engaging section comprises a plurality of meshing teeth arranged uniformly, and the first driven wheel and the second driven wheel each comprise a gear wheel capable of meshing with the meshing teeth.

[0008] On the basis of the above technical scheme, the transmission assembly further comprises a first engaging portion and a second engaging portion, the first engaging portion comprises a first rack fixedly connected to the movable block upward, the first rack is capable of meshing with the first driven wheel, the first driven wheel drives the movable block to slide in the first direction through the first rack, the second engaging portion comprises a second rack fixedly connected to the movable block downward, the second rack is capable of meshing with the second driven wheel, and the second driven wheel drives the movable block to slide in the second direction through the second rack.

[0009] On the basis of the above technical scheme, the first driven wheel and the second driven wheel are centrally symmetrically arranged on both sides of the driving wheel, and the corresponding central angle of the engaging section is less than 180°.

[0010] On the basis of the above technical scheme, further comprising a locking assembly, the locking assembly comprises a first locking block, a second locking block, a third locking block and a fourth locking block, the first locking block and the second locking block are arranged on both ends of the engaging section and are centrally symmetrically arranged on the driving wheel, the third locking block is fixedly arranged on the first driven wheel and the end face facing the driving wheel is a third arc surface capable of abutting with the first locking block, and the arc opening of the third arc surface faces the center of the driving wheel, and the fourth locking block is fixedly arranged on the second driven wheel and the end face facing the driving wheel is a fourth arc surface capable of abutting with the second locking block, and the arc opening of the fourth arc surface faces the center of the driving wheel.

[0011] On the basis of the above technical scheme, the first locking block, the second locking block, the third locking block and the fourth locking block are designed such that when the engagement of the driving wheel with the first driven wheel or the second driven wheel ends, the third locking block and the fourth locking block begin to abut with the first locking block and the second locking block, so as to avoid rotation of the first driven wheel and the second driven wheel.

[0012] On the basis of the above technical scheme, the two piston rods are coaxial with the movable block.

[0013] On the basis of the above technical scheme, on the basis of the above technical scheme, the shell body is further fixed with two cylinder sleeves, the cylinder sleeve is sleeved on the piston outside of the piston rod and is communicated with the inner cavity of the hydraulic end.

[0014] Advantages

[0015] The application has reasonable structure, the transmission assembly includes a driving wheel, a first driven wheel and a second driven wheel, wherein the driving wheel includes an engaging section and a non-engaging section, when the engaging section engages with the first driven wheel, the movable block and the piston rod thereon can be driven to displace in a first direction, when the engaging section engages with the second driven wheel, the movable block and the piston rod thereon can be driven to displace in a second direction, the design is ingenious, the structure is compact, the volume is small, the structure is greatly simplified, the production and manufacturing cost and the maintenance cost are reduced, the transmission assembly in the application drives the piston rod to slide at a uniform speed, so that the output pressure fluctuation of the hydraulic end is small, the equipment running stability is improved, and the use of the discharge accumulator can be reduced, the first driven wheel and the second driven wheel are symmetrically arranged on the two sides of the driving wheel, the transmission assembly has good stability, and the movable block can be prevented from being biased under stress. In the application, the corresponding central angle of the engaging section is less than 180°, so that on the one hand, the left and right sliding strokes of the movable block are consistent, and on the other hand, the engaging section is prevented from engaging with the first driven wheel and the second driven wheel at the same time to cause failure. The application further includes a locking assembly, when the corresponding central angle of the engaging section is less than 180°, such as 160°, when the driving wheel rotates, the process includes the end of engagement with the first driven wheel (the second driven wheel) and the process of not engaging with the second driven wheel (the first driven wheel), in order to prevent the two driven wheels from rotating under the action of inertia or the reaction force of the hydraulic end to cause the movable block to float and slide left and right, the third and fourth locking blocks in the locking assembly reduce the impact on the driving wheel by clamping the driving wheel through the first and second locking blocks, and on the other hand, the first and second locking blocks are arranged to prevent the two driven wheels from rotating by the third and fourth locking blocks when the two driven wheels are separated from the driving wheel, the structure is ingenious and has good stability. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only one embodiment of the application, and for those skilled in the art, other drawings can be obtained from the provided drawings without creating labor.

[0017] Figure 1 : the schematic diagram of the driving structure of the hydraulic end of a mud pump;

[0018] Figure 2 : the schematic diagram of the structure of the application;

[0019] Figure 3Fig. 1 is a schematic view of a structure of a movable block and a transmission assembly;

[0020] Figure 4 Fig. 2 is a schematic view of a structure of a driving wheel in the transmission assembly;

[0021] Figure 5 Fig. 3 is a schematic view of a structure of the driving wheel and a first driven wheel when the driving wheel starts to engage with the first driven wheel in one reciprocating stroke of the movable block;

[0022] Figure 6 Fig. 4 is a schematic view of a structure of the driving wheel and the first driven wheel when the driving wheel ends to engage with the first driven wheel in one reciprocating stroke of the movable block;

[0023] Figure 7 Fig. 5 is a schematic view of a structure of the driving wheel and a second driven wheel when the driving wheel starts to engage with the second driven wheel in one reciprocating stroke of the movable block;

[0024] Figure 8 Fig. 6 is a schematic view of a structure of the driving wheel and the second driven wheel when the driving wheel ends to engage with the second driven wheel in one reciprocating stroke of the movable block;

[0025] Figure 9 Fig. 7 is a schematic view of a movement of the movable block and the transmission assembly in one reciprocating stroke of the movable block; DETAILED DESCRIPTION

[0026] The following description and drawings are illustrative of the specific embodiments herein and are not intended to limit the scope of the embodiments. Parts and features of some embodiments can be included in, or alternative parts and features of other embodiments can be substituted for, parts and features of the other embodiments. The range of the embodiments herein is encompassed by the entire scope of the following claims, and all available equivalents thereof. In this document, the terms "first," "second," and the like, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. In fact, a first element can be termed a second element, and, conversely, a second element can be termed a first element without departing from the scope of the present embodiments. Also, the terms "comprise," "comprises," or "comprising" and the like, are intended to encompass non-exclusive inclusions, such that a structure, device, or apparatus that comprises a list of elements is not necessarily limited to those elements, but can include other elements not expressly listed, or even other elements that are inherent in such structure, device, or apparatus. In the absence of a more restrictive indication, an element defined by the phrase "comprising a... " does not exclude the presence of additional identical elements in the structure, device, or apparatus that includes the element. The various embodiments are described in a progressive manner, each emphasizing the differences from the other embodiments, and the same or similar parts between the various embodiments are cross-referenced.

[0027] The terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used in this document to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings. They are used solely for the convenience of describing the document and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description herein, unless otherwise specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two elements; they can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0028] In this document, unless otherwise stated, the term "multiple" means two or more.

[0029] In this article, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0030] In this article, the term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0031] like Figures 2-9 A hydraulic drive device for petroleum equipment, shown, includes a hollow shell body 1, a movable block 2, a transmission assembly 3, and a drive unit (not shown); as Figure 2 As shown, two cylinder liners 8 are also fixed inside the shell body 1. The cylinder liners 8 are sleeved outside the piston 51 of the piston rod 5 and communicate with the inner cavity of the hydraulic end 9.

[0032] The movable block 2 is located inside the shell body 1. Both ends of the movable block 2 are respectively fixed with piston rods 5 that cooperate with the inner cavity of the hydraulic end 9. The two piston rods 5 are coaxial with the movable block 2.

[0033] Two guide plates 6 are fixed inside the shell body 1. The two guide plates 6 are respectively located on both sides of the movable block 2 and are slidably connected to the movable block 2.

[0034] The guide plate 6 is further fixed with vertically arranged partitions 7 at both ends of the shell body 1. The two partitions 7 divide the inner cavity of the shell body 1 into three independent chambers. The piston rod 5 passes through the partitions 7, and a linear bearing is sleeved between the piston rod 5 and the partitions 7. This can create a good working environment for the movable block 2 and the transmission assembly 3, and can also support the piston rod 5 to avoid forming a cantilever structure.

[0035] The transmission assembly 3 includes a driving wheel 31, a first driven wheel 32, a second driven wheel 33, a first engaging part 34, and a second engaging part 35. The first engaging part 34 includes a first rack that is fixedly connected upward to the movable block 2, and the second engaging part 35 includes a second rack that is fixedly connected downward to the movable block 2.

[0036] like Figure 4 As shown, the driving gear 31 is an incomplete gear, meaning its outer periphery includes an engaging section 311 and a non-engaging section 312, and the engaging section 311 includes a plurality of evenly distributed meshing teeth. Both the first driven gear 32 and the second driven gear 33 include gears that can mesh with the meshing teeth. The first driven gear 32 and the second driven gear 33 are respectively and engageably disposed on both sides of the driving gear 31. The drive unit can transmit rotational motion to the driving gear 31, such as... Figure 3 As shown, the first driven wheel 32 and the second driven wheel 33 are centrally symmetrically disposed on both sides of the driving wheel 31. In this embodiment, the central angle corresponding to the engagement section 311 is 160°. In other embodiments of the present invention, the central angle corresponding to the engagement section 311 can be between 150° and 180°. When the radius of the driving wheel 31 is fixed, the central angle depends on the sliding stroke of the movable block 2.

[0037] like Figure 3 As shown, the first rack corresponds to and can mesh with the first driven wheel 32. The first driven wheel 32 drives the movable block 2 to slide in a first direction through the first rack. The second rack can mesh with the second driven wheel 33. The second driven wheel 33 drives the movable block 2 to slide in a second direction through the second rack.

[0038] like Figure 3 , Figures 5-9 As shown, when the engaging section 311 of the driving wheel 31 engages with the first driven wheel 32, the non-engaged section 312 of the driving wheel 31 faces the second driven wheel 33, and the first driven wheel 32 drives the first engaging portion 34 at the corresponding position to slide along the first direction. The first engaging portion 34 then drives the movable block 2 to slide along the first direction, causing the piston 51 to slide along the first direction. When the engaging section 311 of the driving wheel 31 engages with the second driven wheel 33, the non-engaged section 312 of the driving wheel 31 faces the first driven wheel 32, and the second driven wheel 33 drives the second engaging portion 35 at the corresponding position to slide along the second direction opposite to the first direction. The second engaging portion 35 then drives the movable block 2 to slide along the second direction, causing the piston 51 to slide along the second direction.

[0039] like Figure 3Also shown, the locking assembly 4 includes a first locking block 41, a second locking block 42, a third locking block 43 and a fourth locking block 44, the first locking block 41 and the second locking block 42 are separately arranged on the two ends of the engaging section 311 and are symmetrically arranged on the end face of the driving wheel 31, the third locking block 43 is fixedly arranged on the end face of the first driven wheel 32 and the end face facing the driving wheel 31 is a third arc surface which can be attached to the first locking block 41, and the arc opening of the third arc surface faces the center of the driving wheel 31, and the fourth locking block 44 is fixedly arranged on the end face of the second driven wheel 33 and the end face facing the driving wheel 31 is a fourth arc surface which can be attached to the second locking block 41, and the arc opening of the fourth arc surface faces the center of the driving wheel 31, in this embodiment, when the driving wheel 31 ends the engagement with the first driven wheel 32 or the second driven wheel 33, the third locking block 43 and the fourth locking block 44 start to attach to the first locking block 41 and the second locking block 42, and by means of the third arc surface and the fourth arc surface, the rotation of the first driven wheel 32 and the second driven wheel 33 can be avoided.

[0040] As shown in Figures 5-8 When the driving wheel 31 ends the engagement with the first driven wheel 32 (the second driven wheel 33) and starts the engagement with the second driven wheel 33 (the first driven wheel 32), the third locking block 43 and the fourth locking block 44 hold and position the driving wheel 31 through the first locking block 41 and the second locking block 42, so as to avoid the left and right floating of the driving wheel 31 under the action of the inertia of the two driven wheels or the hydraulic end reaction force, and at the same time, the third arc surface and the fourth arc surface are both arc surfaces with arc openings facing the center of the driving wheel 31, so that the first locking block 41 and the second locking block 42 can limit the movement of the first driven wheel 32 and the second driven wheel 33, and the structure design is ingenious and has good stability.

[0041] Working process

[0042] In this embodiment, the driving wheel 31 is an incomplete gear, the corresponding central angle of the engaging section 311 is 160°, and the working process is taken as an example of one reciprocating stroke of the movable block 2, as shown in Figure 9 The driving wheel 31 rotates counterclockwise, and the starting point is that the driving wheel 31 starts to engage with the first driven wheel 32.

[0043] Firstly, the driving wheel 31 starts to engage with the first driven wheel 32, as shown in Figure 5 The first locking block 41 and the third locking block 43 start to move away and do not contact, and then the driving wheel 31 rotates 160° under the action of the driving unit, as shown in Figure 6 Until the driving wheel 31 ends the engagement with the first driven wheel 32, and the sliding of the movable block 2 to the left ends.

[0044] Second step, the driving wheel 31 continues to rotate counterclockwise, the first locking block 41 begins to contact with the fourth locking block 44, the driving wheel 31 rotates 20° under the action of the driving unit until the first locking block 41 and the fourth locking block 44 are out of contact, as shown in the figure, during this process, the driving wheel 31 is not engaged with the first driven wheel 32 and the second driven wheel 33, and the cooperation of the first locking block 41, the second locking block 42, the third locking block 43 and the fourth locking block 44 can avoid the rotation of the driven wheel under the action of inertia or the reaction force of the fluid end. Figure 7

[0045] Third step, the driving wheel 31 continues to rotate counterclockwise, as shown in the figure, the fourth locking block 44 begins to move away from the first locking block 41, then the driving wheel 31 continues to rotate 160° under the action of the driving unit, as shown in the figure, until the driving wheel 31 is engaged with the second driven wheel 33 and the displacement of the movable block 2 to the right ends. Figure 7 Figure 8

[0046] Fourth step, the driving wheel 31 continues to rotate counterclockwise, the first locking block 41 begins to contact with the third locking block 43, during this process, the driving wheel 31 is not engaged with the first driven wheel 32 and the second driven wheel 33, and the cooperation of the first locking block 41, the second locking block 42, the third locking block 43 and the fourth locking block 44 can avoid the rotation of the driven wheel under the action of inertia or the reaction force of the fluid end, the driving wheel 31 rotates 20° under the action of the driving unit until the third locking block 43 moves away from the first locking block 41 and is not in contact, and returns to the initial position, as shown in the figure. Figure 5

[0047] The above describes the present application by way of example, but the present application is not limited to the above specific embodiments, any modification or change made on the basis of the present application is within the scope of the present application.​​​​

Claims

1. A hydraulic drive device for oilfield equipment, characterized in that, The device includes a hollow shell body (1), a movable block (2), a transmission assembly (3), and a drive unit. The movable block (2) is located inside the shell body (1) and is slidably connected to the shell body (1). Piston rods (5) that cooperate with the inner cavity of the hydraulic end (9) are fixed to both ends of the movable block (2). The transmission assembly (3) includes a drive wheel (31), a first driven wheel (32), and a second driven wheel (33). The first driven wheel (32) and the second driven wheel (33) are respectively disposed on both sides of the drive wheel (31) and can be engaged. The drive unit can transmit rotational motion to the drive wheel (31). The outer side of the drive wheel (31) The circumference includes an engagement section (311) and a non-engagement section (312). When the engagement section (311) of the driving wheel (31) engages with the first driven wheel (32), the non-engagement section (312) of the driving wheel (31) faces the second driven wheel (32), and the first driven wheel (32) drives the movable block (2) to slide along a first direction. When the engagement section (311) of the driving wheel (31) engages with the second driven wheel (33), the non-engagement section (312) of the driving wheel (31) faces the first driven wheel (32), and the second driven wheel (33) drives the movable block (2) to slide along a second direction opposite to the first direction.

2. The hydraulic drive device for petroleum equipment according to claim 1, characterized in that, The transmission assembly (3) further includes a first engagement portion (34) and a second engagement portion (35). The first engagement portion (34) is fixed inside the movable block (2) and corresponds to the position of the first driven wheel (32). The first driven wheel (32) drives the movable block (2) to slide along a first direction through the first engagement portion (34). The second engagement portion (35) is fixed on the movable block (2) and corresponds to the position of the second driven wheel (33). The second driven wheel (33) drives the movable block (2) to slide along a second direction through the second engagement portion (35).

3. The hydraulic end drive device for petroleum equipment according to claim 2, characterized in that, The driving wheel (31) is an incomplete gear, the engagement section (311) includes a plurality of evenly distributed meshing teeth, and the first driven wheel (32) and the second driven wheel (33) both include gears that can mesh with the meshing teeth.

4. The hydraulic end drive device for petroleum equipment according to claim 3, characterized in that, The transmission assembly (3) further includes a first engagement portion (34) and a second engagement portion (35). The first engagement portion (34) includes a first rack fixedly connected upward to the movable block (2). The first rack can mesh with a first driven wheel (32). The first driven wheel (32) drives the movable block (2) to slide in a first direction through the first rack. The second engagement portion (35) includes a second rack fixedly connected downward to the movable block (2). The second rack can mesh with a second driven wheel (33). The second driven wheel (33) drives the movable block (2) to slide in a second direction through the second rack.

5. The hydraulic end drive device for petroleum equipment according to claim 4, characterized in that, The first driven wheel (32) and the second driven wheel (33) are centrally symmetrically arranged on both sides of the driving wheel (31), and the central angle corresponding to the engagement section (311) is less than 180°.

6. The hydraulic end drive device for petroleum equipment according to claim 4 or 5, characterized in that, It also includes a locking assembly (4), which includes a first locking block (41), a second locking block (42), a third locking block (43) and a fourth locking block (44). The first locking block (41) and the second locking block (42) are respectively disposed at both ends of the engagement section (311) and are centrally symmetrically disposed on the driving wheel (31). The third locking block (43) is fixed on the first driven wheel (32) and its end face facing the driving wheel (31) is a third arc surface that can fit with the first locking block (41), and the arc opening of the third arc surface faces the center of the driving wheel (31). The fourth locking block (44) is fixed on the second driven wheel (33) and its end face facing the driving wheel (31) is a fourth arc surface that can fit with the second locking block (42), and the arc opening of the fourth arc surface faces the center of the driving wheel (31).

7. The hydraulic end drive device for petroleum equipment according to claim 6, characterized in that, The first locking block (41), the second locking block (42), the third locking block (43) and the fourth locking block (44) are designed such that when the driving wheel (31) finishes engaging with the first driven wheel (32) or the second driven wheel (33), the third locking block (43) and the fourth locking block (44) begin to engage with the first locking block (41) and the second locking block (42) to prevent the first driven wheel (32) and the second driven wheel (33) from rotating, and to ensure that the starting position remains unchanged during the next engagement.

8. The hydraulic end drive device for petroleum equipment according to claim 6, characterized in that, The two piston rods (5) are coaxial with the movable block (2).

9. The hydraulic end drive device for petroleum equipment according to claim 7, characterized in that, Two guide plates (6) are fixed inside the shell body (1). The two guide plates (6) are respectively located on both sides of the movable block (2) and are slidably connected to the movable block (2). The shell body (1) at both ends of the guide plates (6) is also fixed with partition plates (7). The two partition plates (7) divide the inner cavity of the shell body (1) into three independent chambers. The piston rod (5) passes through the partition plates (7), and a linear bearing is sleeved between the piston rod (5) and the partition plates (7).

10. The hydraulic end drive device for petroleum equipment according to any one of claims 7 to 9, characterized in that, Two cylinder sleeves (8) are also fixed inside the shell body (1). The cylinder sleeves (8) are sleeved outside the piston of the piston rod (5) and are connected to the inner cavity of the hydraulic end (9).

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