A quick-disassembly valve cover

Abstract

The present invention discloses a quick-disassembly valve cover, comprising a cylinder head flange and a clamping fluid cylinder assembly, wherein the outer surface of the clamping fluid cylinder assembly is threadedly connected to the upper half of the inner surface of the cylinder head flange, the outside of the clamping fluid cylinder assembly and located at the top of the cylinder head flange are fixedly connected to a back-off disk by a first screw, and the outer side of the back-off disk is pressed against the top of the cylinder head flange, and the outer side of the back-off disk is evenly opened with a plurality of semi-conical holes. The present invention relates to the technical field of oil drilling equipment. The quick-disassembly valve cover, by providing a back-off disk and a locking screw that cooperates with the locking screw hole on the cylinder head flange, does not require applying a large torque to the valve cover thread during installation or removal. During installation, a small tightening torque is used to tighten and prevent it from loosening, thereby avoiding the problem of the valve cover loosening and reducing the labor intensity during frequent replacement and maintenance of the hydraulic end valve assembly.

Description

Technical Field

[0001] The invention relates to the technical field of oil drilling equipment, in particular to a quickly disassembled valve cover. Background Art

[0002] Currently, the valve assembly plug in the hydraulic end of a drilling or fracturing pump is clamped by a valve cover with a large-pitch trapezoidal thread. Because the liquid pressure in the hydraulic cylinder of a drilling or fracturing pump is high and fluctuates greatly during operation, the valve cover can easily loosen, causing the seal at the valve assembly plug to quickly fail, and even causing the high-pressure fluid in the hydraulic cylinder to puncture the hydraulic cylinder. Furthermore, the existing valve cover clamping structure requires a large amount of torque for both installation and removal, which increases the labor intensity during frequent replacement and maintenance of the hydraulic end valve assembly and reduces the operating efficiency and reliability of the drilling or fracturing pump. Summary of the Invention

[0003] In view of the deficiencies in the prior art, the present invention provides a quickly disassembled valve cover, which solves the problems of excessive labor intensity and low efficiency when replacing or maintaining the cylinder valve assembly of a drilling pump or a fracturing pump.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a quick-disassembly valve cover, comprising a cylinder head flange and a clamping liquid cylinder assembly, and the outer surface of the clamping liquid cylinder assembly is threadedly connected to the upper half of the inner surface of the cylinder head flange, the outside of the clamping liquid cylinder assembly and located on the top of the cylinder head flange is fixedly connected with a back-up plate by a first screw, and the outer side of the back-up plate is pressed onto the top of the cylinder head flange, a number of semi-conical holes are evenly opened on the outside of the back-up plate, and an anti-loosening screw hole is opened on the top of the cylinder head flange, and the back-up plate can be fixed to the top of the cylinder head flange by an anti-loosening screw that passes through one of the semi-conical holes and is threadedly connected to the anti-loosening screw hole.

[0005] Preferably, the clamping hydraulic cylinder assembly mainly includes a clamping hydraulic cylinder, a second screw, a third screw, a piston, a cylinder head, a piston rod, a first O-ring, a second O-ring and a third O-ring. A hydraulic cylinder oil inlet is opened in the center of the top of the clamping hydraulic cylinder, the cylinder head is threadedly connected to the bottom of the clamping hydraulic cylinder, and the first O-ring is sleeved on the outside of the cylinder head, the piston is slidably connected to the inside of the clamping hydraulic cylinder, and the second O-ring is sleeved on the outer circular surface of the piston, the top end of the piston rod is fixedly connected to the bottom of the piston by an embedded third screw, and the third O-ring is arranged inside the embedded groove at the bottom of the piston, and the second screw passes through the clamping hydraulic cylinder and is clamped on the top of the cylinder head.

[0006] Preferably, the bottom end of the piston rod is fixedly connected to a pressure plate, and slideways are provided between the bottom of the cylinder cover and the top of the pressure plate and the side surface of the piston rod, and the bottom surface of the slideway at the top of the pressure plate is an inclined surface.

[0007] Preferably, the upper and lower groups of slideways are cross-arranged in two rows, and a first wedge-shaped slider group and a second wedge-shaped slider group are respectively provided inside the two rows of slideways.

[0008] Preferably, the first wedge slider group and the second wedge slider group are both composed of a left wedge slider, a right wedge slider, a pull rod screw, a retaining ring and a plug. The left end of the pull rod screw is threadedly connected to the inner surface of the left wedge slider, and the retaining ring and the plug are respectively sleeved on the outside of the right end of the pull rod screw from left to right, and the right wedge slider is sleeved on the outside of the pull rod screw and threadedly connected to the outer surface of the plug.

[0009] Preferably, both ends of the pull rod screw are sleeved with compression springs, and the two ends of the two compression springs respectively abut against the left wedge-shaped slider and the inner surface of the compression hydraulic cylinder and the right wedge-shaped slider and the inner surface of the compression hydraulic cylinder.

[0010] Preferably, an operating hole is opened on the side of the cylinder head flange, and the cylinder head flange is fixedly connected to the top of the high-pressure pump cylinder by a plurality of cylinder connecting screws. A valve assembly plug is crimped at the center of the top of the high-pressure pump cylinder, and the pressure plate is pressed against the top of the valve assembly plug.

[0011] Beneficial effects

[0012] The present invention provides a quick-disassembly valve cover. Compared with the prior art, it has the following advantages:

[0013] (1) The quick-disassembly valve cover is provided with a retaining plate and anti-loosening screws in conjunction with the anti-loosening screw holes on the cylinder head flange, so that no large torque needs to be applied to the valve cover threads during installation or disassembly. During installation, a small tightening torque is used to tighten and prevent it from loosening, thereby avoiding the problem of the valve cover loosening and reducing the labor intensity during frequent replacement and maintenance of the hydraulic end valve assembly.

[0014] (2) The quick-disassembly valve cover can pressurize the hydraulic cylinder of the quick-disassembly valve cover as required by the structure in the compression cylinder assembly, and then use the wedge-shaped compression mechanism of the quick-disassembly valve cover to expand and tighten the piston of the quick-disassembly valve cover without releasing the pressure. Since the wedge-shaped block compression structure has excellent self-locking and automatic anti-loosening functions, the quick-disassembly valve cover will not lose its compression function on the valve assembly plug even after the pressure is released. The quick-disassembly valve cover has a simple and novel structure and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an assembly diagram of the present invention;

[0016] Figure 2 It is an explosion diagram of the present invention;

[0017] Figure 3A perspective view of a cylinder head flange according to the present invention;

[0018] Figure 4 is a cross-sectional view of the compacting fluid cylinder assembly of the present invention;

[0019] Figure 5 An exploded view of the compacting fluid cylinder assembly of the present invention;

[0020] Figure 6 This is a structural diagram of the compacting hydraulic cylinder of the present invention;

[0021] Figure 7 Schematic diagram of the structure of the piston of the present invention;

[0022] Figure 8 is a perspective view of the cylinder head of the present invention;

[0023] Figure 9 A three-dimensional diagram of the piston rod and the pressure plate of the present invention;

[0024] Figure 10 This is a schematic structural diagram of the anti-retraction disk of the present invention;

[0025] Figure 11 It is an assembly and explosion diagram of the wedge-shaped slider assembly of the present invention;

[0026] Figure 12 is a cross-sectional view of a wedge-shaped slider assembly of the present invention;

[0027] Figure 13 It is a three-dimensional diagram of the pull rod screw and the retaining ring of the present invention.

[0028] In the figure: 1. Cylinder connecting screw; 2. Cylinder head flange; 3. Anti-loosening screw; 4. Check plate; 5. Clamping cylinder assembly; 6. First screw; 7. Clamping hydraulic cylinder; 8. Second screw; 9. Third screw; 10. Piston; 11. Cylinder head; 12. Piston rod; 13. Pull rod screw; 14. Compression spring; 15. First wedge-shaped slider group; 16. Plug; 17. Second wedge-shaped slider group; 18. Retaining spring; 19. Hydraulic cylinder oil inlet; 20. Pressure plate; 21. Anti-loosening screw hole; 22. Operating hole; 23. Semi-conical hole; 25. First O-ring; 26. Second O-ring; 27. Valve assembly plug; 28. Left wedge-shaped slider; 29. Right wedge-shaped slider; 30. Third O-ring; 32. High-pressure pump cylinder; 33. Slideway. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] See also Figure 1-13 The present invention provides a technical solution: a quick-disassembly valve cover, comprising a cylinder head flange 2 and a clamping liquid cylinder assembly 5, and the outer surface of the clamping liquid cylinder assembly 5 is threadedly connected to the upper half of the inner surface of the cylinder head flange 2, and the outside of the clamping liquid cylinder assembly 5 and located on the top of the cylinder head flange 2 is fixedly connected with a back-up plate 4 by a first screw 6, and the outer side of the back-up plate 4 is pressed onto the top of the cylinder head flange 2, and a plurality of semi-conical holes 23 are evenly opened on the outer side of the back-up plate 4, and an anti-loosening screw hole 21 is opened on the top of the cylinder head flange 2, and the back-up plate 4 can be fixed to the top of the cylinder head flange 2 by a anti-loosening screw 3 that passes through one of the semi-conical holes 23 and is threadedly connected to the anti-loosening screw hole 21.

[0031] The clamping hydraulic cylinder assembly 5 mainly includes a clamping hydraulic cylinder 7, a second screw 8, a third screw 9, a piston 10, a cylinder head 11, a piston rod 12, a first O-ring 25, a second O-ring 26 and a third O-ring 30. A hydraulic cylinder oil inlet 19 is opened in the center of the top of the clamping hydraulic cylinder 7. The cylinder head 11 is connected to the bottom of the clamping hydraulic cylinder 7, and the first O-ring 25 is sleeved on the outside of the cylinder head 11. The piston 10 is slidably connected to the inside of the clamping hydraulic cylinder 7, and the second O-ring 26 is sleeved on the side of the piston 10. The top end of the piston rod 12 is fixedly connected to the bottom of the piston 10 by the third screw 9 in an embedded manner, and the third O-ring 30 is arranged inside the embedded groove at the bottom of the piston 10. The second screw 8 passes through the clamping hydraulic cylinder 7 and is clamped on the top of the cylinder head 11.

[0032] The bottom end of the piston rod 12 is fixedly connected to the pressure plate 20, and the bottom of the cylinder head 11, the top of the pressure plate 20 and the side of the piston rod 12 are all provided with slideways 33, and the bottom surface of the slideway 20 on the top of the pressure plate 20 is an inclined surface; the upper and lower groups of slideways 33 are cross-arranged in two rows, and the interiors of the two rows of slideways 33 are respectively provided with a first wedge-shaped slider group 15 and a second wedge-shaped slider group 17; the first wedge-shaped slider group 15 and the second wedge-shaped slider group 17 are both composed of a left wedge-shaped slider 28, a right wedge-shaped slider 29, a pull rod screw 13, a retaining ring 1 8 and a plug 16, the left end of the pull rod screw 13 is threadedly connected to the inner surface of the left wedge-shaped slider 28, the retaining spring 18 and the plug 16 are respectively sleeved on the outside of the right end of the pull rod screw 13 from left to right, the right wedge slider 29 is sleeved on the outside of the pull rod screw 13 and threadedly connected to the outer surface of the plug 16; both ends of the pull rod screw 13 are sleeved with compression springs 14, and the two ends of the two compression springs 14 respectively abut against the left wedge slider 28 and the inner surface of the clamping hydraulic cylinder 7 and the right wedge slider 29 and the inner surface of the clamping hydraulic cylinder 7.

[0033] An operating hole 22 is opened on the side of the cylinder head flange 2, and the cylinder head flange 2 is fixedly connected to the top of the high-pressure pump cylinder 32 by a number of cylinder connecting screws 1. A valve assembly plug 27 is pressed into the center of the top of the high-pressure pump cylinder 32, and the pressure plate 20 is pressed tightly against the top of the valve assembly plug 27.

[0034] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0035] Please follow the steps below to install:

[0036] Step 1: Install the cylinder head flange 2: Install the cylinder head flange 2 on the high-pressure pump cylinder 32 using the cylinder connecting screws 1, and then install the valve assembly plug 27. After the cylinder head flange 2 is installed, it can be used as a part of the high-pressure pump cylinder 32 and does not need to be disassembled later.

[0037] Step 2: Install the compression cylinder assembly 5 and the retaining plate 4 as follows:

[0038] 1. Install a third O-ring 30 into the sealing groove in the inner bore of the cylinder head 11. Then install the cylinder head 11 onto the outer cylinder on the upper part of the piston rod 12. Then install another third O-ring 30 into the sealing groove in the inner bore of the piston 10. At the same time, install the aforementioned piston rod 12 into the inner bore of the piston 10. Secure the piston rod 12 and piston 10 together with the third screw 9.

[0039] 2. Installing the hydraulic cylinder and piston 10: First, install the first O-ring 25 and the two second O-rings 26 in the sealing grooves on the outer circle of the positioning stop of the cylinder head 11 and the outer circle of the piston 10, respectively. Then, install the left and right wedge-shaped sliders in the slideway between the already installed cylinder head 11 and the piston rod 12. Then, install the already installed piston rod 12 and cylinder head 11 into the inner hole of the compression hydraulic cylinder 7. At the same time, align the screw holes of the left and right wedge-shaped sliders with the operating holes 22 on the lower part of the compression hydraulic cylinder 7. Finally, tighten the cylinder head 11 and the compression hydraulic cylinder 7 with the second screw 8.

[0040] 3. Installation of the first wedge slider group 15 and the second wedge slider group 17: According to step 2, the left and right wedge sliders have been installed in the slideway 33 between the cylinder head 11 and the piston rod 12, and the screw holes of the left and right wedge sliders correspond to the operating hole 22 at the bottom of the compression hydraulic cylinder 7. First, align the plug 16 and the compression spring 14 with the threaded holes of the left and right wedge sliders, then install the retaining ring 18 in the corresponding groove of the tie rod screw 13, and then insert the tie rod screw 13 from the operating hole 22 outside the compression hydraulic cylinder 7 and pass through the plug 16 and the compression spring 14. Finally, screw the external thread at the front end of the tie rod screw 13 into the threaded hole of the left wedge slider 28. In this way, under the action of the compression springs 14 at both ends of each set of wedge slider groups, the two sets of wedge slider groups can move in opposite directions at the same time in the slideway of the cylinder head 11. Since the contact surfaces between the left and right wedge sliders and the slideway 33 of the cylinder head 11 are planar structures, and since the slideway 33 of the cylinder head 11 is a planar structure, the left and right wedge sliders will not cause the distance between the left and right wedge sliders and the cylinder head 11 to change when they slide in the slideway 33 of the cylinder head 11. In addition, due to the wedge-shaped structure of the lower surfaces of the left and right wedge sliders and the slideway 33 of the piston rod 12, when the left and right wedge sliders slide inward in the slideway 33 of the piston rod 12, the piston rod 12 will move downward along its axial direction for a certain distance.

[0041] Step 3, installation of the retaining plate 4: Install the retaining plate 4 on the upper end surface of the installed pressing cylinder assembly 5 using the first screw 6, while making the large semi-circular end of the semi-conical hole 23 around the retaining plate 4 face outward;

[0042] Step 4, installation of the clamping cylinder assembly 5: install the assembled clamping cylinder assembly 5 with the anti-retraction disk 4 and the wedge-shaped slider group into the threaded hole of the cylinder head flange 2 of the cylinder through threads. During installation, the lower end surface of the piston rod 12 of the clamping cylinder assembly 5 should be in contact with the upper top surface of the valve assembly plug 27. At the same time, by adjusting the clamping cylinder assembly 5, the pull rod screw 13 is made to correspond to the operating hole 22 of the cylinder head flange 2. At this time, a semi-conical hole 23 around the anti-retraction disk 4 also corresponds to the anti-loosening screw hole 21 on the cylinder head flange 2. Then install the anti-loosening screw 3 in the anti-loosening screw hole 21 on the cylinder head flange 2. At the same time, the clamping conical surface of the anti-loosening screw 3 will contact the inner circular surface of the corresponding semi-conical hole 23 on the anti-retraction disk 4 and stick to it as the anti-loosening screw 3 is tightened. After the above operation, the clamping cylinder assembly 5 will not rotate relative to the cylinder head flange 2.

[0043] Step 5, pressurize the valve cover for quick disassembly and assembly: After the pressing cylinder assembly 5 is installed on the cylinder according to the above method, the hydraulic cylinder oil inlet 19 of the pressing cylinder assembly 5 can be pressurized according to the required pressure, and the piston rod 12 of the pressing cylinder assembly 5 will move downward and press the valve assembly plug 27 below it. Since the lower end face of the piston rod 12 is in contact with the upper end face of the valve assembly plug 27 before pressing, when the pressing cylinder assembly 5 is pressed, the downward movement distance of the piston rod 12 is very small. At this time, During pressure relief, the pull rod screw 13 is rotated through the operating hole 22 of the cylinder head flange 2. Under the tension of the pull rod screw 13, the left and right wedge sliders of the two wedge slider groups simultaneously move centripetally along the slideway 33. At the same time, due to the wedge-shaped structure of the left and right wedge sliders and the wedge angle being much smaller than the friction angle of the contact material, once the left and right wedge sliders are wedged in the wedge slideway 33 between the cylinder head 11 and the piston rod 12, they will not slide outward even under great pressure or vibration. At this point, the pressure of the clamping hydraulic cylinder assembly 5 can be relieved. Furthermore, because a compression spring 14 is installed between each wedge slider and the clamping hydraulic cylinder 7, the wedge-shaped self-locking function of the left and right wedge sliders is also enhanced under the action of the spring thrust.

[0044] Step 5. Disassembly of the valve cover for quick disassembly and assembly: When it is necessary to remove the valve assembly plug 27, the hydraulic cylinder of the clamping liquid cylinder assembly 5 is pressurized according to the required pressure. At this time, the pressure between the cylinder head 11 and the piston rod 12 on the left and right wedge-shaped sliders disappears. Then, the pull rod screw 13 is rotated in the opposite direction through the operating hole 22 of the cylinder head flange 2. Under the reverse thrust of the pull rod screw 13, the left and right wedge-shaped sliders of the first wedge-shaped slider group 15 and the second wedge-shaped slider group 17 are simultaneously moved centrifugally outward by one end distance. At the same time, the lower inclined surfaces of the left and right wedge-shaped sliders are also disengaged from the inclined surfaces of the slideways 33 of the piston rod 12 of the clamping liquid cylinder assembly 5. At this time, after the pressure of the clamping liquid cylinder assembly 5 is relieved, no extrusion pressure will be generated between the external thread of the clamping liquid cylinder assembly 5 and the internal thread of the cylinder head flange 2. Then, after removing the anti-loosening screw 3, the clamping liquid cylinder assembly 5 can be easily removed.

[0045] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0046] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A quick-disassembly valve cover, comprising a cylinder head flange (2) and a clamping fluid cylinder assembly (5), wherein the outer surface of the clamping fluid cylinder assembly (5) is connected to the upper half of the inner surface of the cylinder head flange (2) by a threaded connection, characterized in that: The outside of the compression cylinder assembly (5) and located at the top of the cylinder head flange (2) is fixedly connected to a back-off disc (4) by a first screw (6), and the outer side of the back-off disc (4) is pressed onto the top of the cylinder head flange (2), and a plurality of semi-conical holes (23) are evenly opened on the outer side of the back-off disc (4), and a locking screw hole (21) is opened on the top of the cylinder head flange (2), and the back-off disc (4) can be fixed to the top of the cylinder head flange (2) by a locking screw (3) that penetrates one of the semi-conical holes (23) and is threadedly connected to the locking screw hole (21); The clamping hydraulic cylinder assembly (5) mainly includes a clamping hydraulic cylinder (7), a second screw (8), a third screw (9), a piston (10), a cylinder head (11), a piston rod (12), a first O-ring (25), a second O-ring (26) and a third O-ring (30). A hydraulic cylinder oil inlet (19) is provided at the center of the top of the clamping hydraulic cylinder (7). The cylinder head (11) is threadedly connected to the bottom of the clamping hydraulic cylinder (7), and the first O-ring (25) is sleeved on the outside of the cylinder head (11). The piston (10) is slidably connected to the inside of the clamping hydraulic cylinder (7), and the second O-ring (26) is sleeved on the outer circumferential surface of the piston (10). The top end of the piston rod (12) is fixedly connected to the bottom of the piston (10) by the third screw (9), and the third O-ring (30) is arranged inside the embedded groove at the bottom of the piston (10). The second screw (8) passes through the clamping hydraulic cylinder (7) and is clamped on the top of the cylinder head (11). The bottom end of the piston rod (12) is fixedly connected to a pressure plate (20), and a slideway (33) is provided between the bottom of the cylinder cover (11), the top of the pressure plate (20) and the side of the piston rod (12), and the bottom surface of the slideway (33) at the top of the pressure plate (20) is an inclined surface; An operating hole (22) is provided on the side of the cylinder head flange (2). The cylinder head flange (2) is fixedly connected to the high-pressure pump cylinder (32) through a plurality of cylinder connecting screws (1). A valve assembly plug (27) is pressed at the center of the top of the high-pressure pump cylinder (32), and a pressure plate (20) is pressed against the top of the valve assembly plug (27).

2. The quick-disassembly valve cover according to claim 1, characterized in that: The upper and lower groups of slideways (33) are cross-arranged in two rows, and a first wedge-shaped slider group (15) and a second wedge-shaped slider group (17) are respectively provided inside the two rows of slideways (33).

3. The quick-disassembly valve cover according to claim 2, characterized in that: The first wedge slider group (15) and the second wedge slider group (17) are both composed of a left wedge slider (28), a right wedge slider (29), a pull rod screw (13), a retaining spring (18) and a plug (16), wherein the left end of the pull rod screw (13) is threadedly connected to the inner surface of the left wedge slider (28), the retaining spring (18) and the plug (16) are respectively sleeved on the outside of the right end of the pull rod screw (13) from left to right, and the right wedge slider (29) is sleeved on the outside of the pull rod screw (13) and is threadedly connected to the outer surface of the plug (16).

4. The quick-disassembly valve cover according to claim 3, characterized in that: Both ends of the pull rod screw (13) are sleeved with compression springs (14), and the two ends of the two compression springs (14) respectively abut against the inner surface of the left wedge-shaped slider (28) and the inner surface of the clamping hydraulic cylinder (7) and the right wedge-shaped slider (29) and the inner surface of the clamping hydraulic cylinder (7).

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