Plunger pump

Abstract

The utility model discloses a plunger pump, and relates to the field of oil and gas equipment. A plunger pump comprises a power end assembly and a fluid end assembly. The power end assembly comprises a spacing frame, and an integrated base plate is arranged on the side, facing the hydraulic end assembly, of the spacing frame. The fluid end assembly comprises a valve box, and the integrated base plate is detachably connected with the valve box. The integrated valve box body can solve the problem that materials are wasted due to the fact that the integrated valve box body is prone to being integrally scrapped.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of oil and gas equipment, and particularly relates to a plunger pump. BACKGROUND

[0002] Fracturing pumps are commonly used in mining and oilfield applications, in which fracturing fluid (i.e. cement, mud, fracturing sand and other materials) is pumped into a wellbore under high pressure to fracture the producing formation during a fracturing process. Fracturing pumps are widely used in the oil industry as an important device that can improve oil and gas production. In recent years, fracturing equipment has continuously improved the production rate of oilfields. It plays an important role in increasing production in some old oilfields, developing new oilfields and developing emerging shale gas.

[0003] The fracturing pump mainly consists of a power end, a fluid end and a gear reduction box. The power end is structurally connected to the reduction box and the fluid end valve box, converts the rotary mechanical energy transmitted by the reduction box into reciprocating mechanical energy to drive the suction and discharge functions of the fluid end, the fluid end is responsible for pressurizing low-pressure fluid into high-pressure fluid and outputting to a high-pressure manifold, and the reduction box is responsible for reducing the high-speed power input by the power source to low-speed power through multiple stages of reduction and then inputting to the power end. Due to the limitation of space arrangement and the need for convenient disassembly and maintenance, most fracturing pumps are of a horizontal straight-line structure, i.e. the center line of the reciprocating movement part of the power end is horizontally arranged and parallel to the center axis of the pressurizing cavity.

[0004] The fluid end system, as a key part of fluid pressurization, mainly consists of a fluid end valve box body, a plunger, a packing assembly, an upper valve assembly, a lower valve assembly, a discharge end cover assembly and a suction end cover assembly. The fluid end valve box body, as the mounting body of all the above-mentioned parts, bears a great working pressure and repeated erosion of fluid, and therefore has a very high requirement for the material strength of the valve box body.

[0005] The valve box body in the related art adopts an integrated forged structure, and the whole body adopts high-cost steel material that is resistant to high pressure, corrosion and impact. The material and processing costs are high, and once the local cavity or thread is damaged, the whole body is scrapped, which easily causes material waste. CONTENT OF THE INVENTION

[0006] The purpose of the embodiments of the application is to provide a plunger pump that can solve the problem of material waste caused by the integrated valve box body being easily scrapped as a whole.

[0007] In order to solve the above technical problems, the application is implemented as follows:

[0008] The embodiments of the application provide a plunger pump, which comprises a power end assembly and a fluid end assembly.

[0009] The power end assembly comprises a spacer frame, and one side of the spacer frame facing the hydraulic end assembly is provided with an integrated base plate;

[0010] The hydraulic end assembly comprises a valve box, and the integrated base plate is detachably connected with the valve box.

[0011] In the embodiment of the present application, the traditional hydraulic end base plate and the end plate of the spacer are arranged as an integrated structure to form an integrated base plate, and the integrated base plate is detachably connected with the valve box, so that the hydraulic end base plate does not need to be arranged separately, and the hydraulic end base plate is mounted to the valve box, and the end plate of the spacer frame is mounted to the hydraulic end base plate, thereby effectively avoiding the situation that the hydraulic end base plate and the valve box are scrapped as a whole due to local damage of the hydraulic end base plate, and to a certain extent, the high cost of replacing the valve box can be reduced, and the service life of the valve box is prolonged; and the hydraulic end base plate and the end plate of the spacer are combined into one, and the bolt connection between the hydraulic end base plate and the end plate of the spacer is cancelled, thereby reducing the number of parts at the connection between the hydraulic end assembly and the power end assembly, simplifying the assembly process, and also reducing the risk of bolt failure due to slippage and disconnection at the connection. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 A structure schematic diagram of a plunger pump disclosed in the embodiment of the present application is shown in the figure;

[0013] Figure 2 A first structure schematic diagram of an integrated base plate disclosed in the embodiment of the present application is shown in the figure;

[0014] Figure 3 A partial schematic diagram of a weight reduction groove disclosed in the embodiment of the present application is shown in the figure;

[0015] Figure 4 A second structure schematic diagram of an integrated base plate disclosed in the embodiment of the present application is shown in the figure;

[0016] Figure 5 A partial schematic diagram of a give-way groove disclosed in the embodiment of the present application is shown in the figure;

[0017] Figure 6 A first structure schematic diagram of a spacer frame disclosed in the embodiment of the present application is shown in the figure;

[0018] Figure 7 A second structure schematic diagram of a spacer frame disclosed in the embodiment of the present application is shown in the figure;

[0019] Figure 8 A partial schematic diagram of a support sleeve disclosed in the embodiment of the present application is shown in the figure;

[0020] Figure 9 A partial schematic diagram of a support leg disclosed in the embodiment of the present application is shown in the figure;

[0021] Figure 10 This is a schematic diagram of the spacer and oil receiving tray disclosed in the embodiments of this application;

[0022] Figure 11 This is a schematic diagram of the oil receiving tray, scraper, and drive rod structures disclosed in the embodiments of this application;

[0023] Figure 12 This is a schematic diagram of the oil receiving tray, oil collection box, scraper, and other structures disclosed in the embodiments of this application.

[0024] Explanation of reference numerals in the attached figures:

[0025] 01-Powertrain Assembly;

[0026] 10-Spacer;

[0027] 11-Integrated substrate; 111-Weight reduction groove; 1111-First sidewall; 1112-Second sidewall; 1113-Bottom wall; 112-Mounting hole; 113-Packaging box through hole; 114-Anti-shrinkage hole; 115-Leaning groove; 116-Drainage groove;

[0028] 12-Connecting end plate; 121-Positioning pin hole;

[0029] 13-Support sleeve;

[0030] 14-Outrigger; 141-First stiffening plate; 142-Second stiffening plate;

[0031] 20-Crosshead Box;

[0032] 30 - Oil receiving tray; 31 - Oil outlet;

[0033] 40 - Scraper; 50 - Drive rod; 60 - Oil collection box;

[0034] 02-Hydraulic end assembly;

[0035] 021-Valve box. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0038] The embodiments of this application will be described in detail below with reference to the accompanying drawings and specific examples and application scenarios.

[0039] refer to Figures 1 to 12 This application discloses a plunger pump, which includes a power end assembly 01 and a hydraulic end assembly 02.

[0040] The power-end assembly 01 includes a spacer 10. Of course, the power-end assembly 01 may also include a crankcase, a crosshead housing 20, and other structures. The crankcase is connected to the crosshead housing 20, and the crosshead housing 20 is connected to the spacer 10. Furthermore, the power-end assembly 01 can also be connected to the hydraulic-end assembly 02 via the spacer 10. It should be noted that the motion principles of both the power-end assembly 01 and the hydraulic-end assembly 02 can be found in relevant technologies and will not be elaborated upon here.

[0041] An integral substrate 11 may be provided on the side of the spacer 10 facing the hydraulic end assembly 02. The integral substrate 11 is connected to the hydraulic end assembly 02 to realize the connection between the power end assembly 01 and the hydraulic end assembly 02.

[0042] The hydraulic end assembly 02 may include a valve box 021, and the integrated base plate 11 and the valve box 021 are detachably connected. In this way, the assembly and disassembly between the integrated base plate 11 and the valve box 021 can be facilitated while ensuring the reliability of the connection.

[0043] In some embodiments, the integrated base plate 11 and the valve box 021 can be connected by bolts to realize the connection between the power end assembly 01 and the hydraulic end assembly 02.

[0044] Based on the above, this embodiment of the application sets the traditional hydraulic end substrate and the end plate of the spacer 10 as an integrated structure. That is, the hydraulic end substrate and the end plate of the spacer 10 are combined into one integrated substrate 11, so that the integrated substrate 11 also has the function of the hydraulic end substrate. There is no need to set a separate hydraulic end substrate, and there is no need to install the hydraulic end substrate to the valve box 021 or install the end plate of the spacer 10 to the hydraulic end substrate. This can effectively avoid the overall failure of the hydraulic end substrate and valve box 021 due to partial damage to the hydraulic end substrate. The occurrence of failure can, to some extent, reduce the high cost of replacing valve box 021 and extend the service life of valve box 021; furthermore, by combining the hydraulic end base plate and the end plate of spacer 10 into one, the bolt connection between the hydraulic end base plate and the end plate of spacer 10 is eliminated, that is, there is no need to fasten the hydraulic end base plate and the end plate of spacer 10 with bolts, thereby reducing the number of parts at the connection between hydraulic end assembly 02 and power end assembly 01, simplifying the assembly process, and also reducing the risk of bolt failure due to slippage and detachment at the connection.

[0045] Alternatively, long bolts can be used to pass directly through the spacer 10 and connect to the valve box 021.

[0046] refer to Figure 2 and Figure 4 In some embodiments, the integrated substrate 11 may be provided with a plurality of mounting holes 112, and a fastener (e.g., bolt) is inserted into each mounting hole 112, which is fastened to the valve box 021.

[0047] The side of the integrated base plate 11 facing away from the valve box 021 may be provided with multiple weight reduction grooves 111, such as... Figure 2 As shown, the weight-reducing groove 111 is located between two adjacent mounting holes 112. Based on this arrangement, the weight of the integrated substrate 11 can be reduced while ensuring the overall strength and rigidity of the integrated substrate 11, thereby reducing material usage and lowering costs.

[0048] Optionally, the integrated substrate 11 can be a rectangular plate. Along the short side of the rectangular plate, one side of the rectangular plate has a row of mounting holes 112, and the other side of the rectangular plate has another row of mounting holes 112. In this way, the integrated substrate 11 is firmly installed to the valve box 021 by fasteners in the multiple mounting holes 112, so as to ensure the firmness and stability of the connection between the integrated substrate 11 and the valve box 021.

[0049] In some more specific embodiments, a weight-reducing groove 111 can be provided between two adjacent mounting holes 112 in each row of mounting holes 112. Based on this, the weight of the integrated substrate 11 can be reduced, and the weight distribution of the integrated substrate 11 can be made more uniform.

[0050] In some embodiments, the integral substrate 11 can be manufactured by casting, which can reduce the manufacturing cost of the integral substrate 11. To facilitate casting demolding, a draft angle can be provided at the weight reduction groove 111.

[0051] As shown in Figure 3, the weight-reducing groove 111 may include two first sidewalls 1111, a second sidewall 1112, and a third sidewall. The two first sidewalls 1111 are spaced apart in a first direction. The second sidewall 1112 is connected to the ends of the two first sidewalls 1111 along a second direction. The bottom wall 1113 is connected to the ends of the two first sidewalls 1111 and the second sidewall 1112 along a third direction, and the first direction, the second direction, and the third direction are perpendicular to each other. Optionally, the first direction may be the length direction of the integral substrate 11, the second direction may be the width direction of the integral substrate 11, and the third direction may be the thickness direction of the integral substrate 11. It should be noted that the weight-reducing groove 111 is through-holes at one end of the integral substrate 11 along the second direction and at one end of the integral substrate 11 along the third direction.

[0052] To form a draft angle, a first included angle θ1 is formed between the extending direction of each first sidewall 1111 and the second direction. The range of the first included angle θ1 is 0° to 60°, including, for example, 0°, 10°, 20°, 30°, 40°, 50°, 60°, etc. Specifically, the weight reduction groove 111 forms a first flare at one end of the integral substrate 11 along the second direction. The draft angle at the first flare is the sum of the first included angles θ1 of the two first sidewalls 1111, that is, 0° to 120°.

[0053] Each first sidewall 1111 extends in a direction that forms a second included angle θ2 with a third direction. The range of the second included angle θ2 is from 0° to 45°, for example, including 0°, 10°, 20°, 30°, 40°, 45°, etc. Specifically, the weight reduction groove 111 forms a second flare at one end of the integral substrate 11 along the third direction. The draft angle at the second flare is the sum of the second included angles θ2 of the two first sidewalls 1111, that is, from 0° to 90°.

[0054] The extension direction of the second sidewall 1112 forms a third included angle θ3 with the third direction. The range of the third included angle θ3 is 0° to 30°, including, for example, 0°, 5°, 10°, 15°, 20°, 25°, 30°, etc. Specifically, the weight reduction groove 111 can also form a third flare at one end of the integral substrate 11 along the third direction. The draft angle at the third flare is the third included angle θ3, that is, 0° to 30°.

[0055] It should be noted that in this embodiment, the shape of the weight reduction groove 111 is not limited. Its arrangement and draft angle can be set according to the size of the integrated substrate 11, the diameter of the packing box of the plunger pump, the cylinder spacing of the plunger pump, and other spatial conditions, as long as the strength of the integrated substrate 11 is not excessively weakened and the casting process requirements are met.

[0056] refer to Figure 5 and Figure 8 In some embodiments, the spacer 10 may further include a support sleeve 13, which is disposed on the side of the integral substrate 11 facing away from the valve box 021, and a weight-reducing groove 111 is formed between two adjacent support sleeves 13. The integral substrate 11 and the support sleeve 13 can be fixedly connected or integrally formed, such as by welding or integral casting. When the integral substrate 11 and the support sleeve 13 are integrally cast, the strength of the joint and the casting process must be considered.

[0057] Based on the above configuration, an arc structure can be provided at the junction of the integrated substrate 11 and the support sleeve 13 (i.e., the junction between the support sleeve 13 and the bottom wall 1113 of the weight reduction groove 111). By providing the arc structure, the stress concentration problem at the junction can be alleviated, which is beneficial to improving the strength of the junction.

[0058] Optionally, the distance between the outer edge of the arc structure away from the outer wall of the support sleeve 13 and the axis of the support sleeve 13 is greater than or equal to twice the radius of the through hole provided in the support sleeve 13. In this way, the strength of the joint can be improved and the uniformity of the wall thickness at the joint can be guaranteed.

[0059] Optionally, the bottom wall 1113 of the weight-reducing groove 111 may be provided with mounting holes 112 for mounting vibration sensors, etc. The shape and position of the mounting holes 112 depend on the size and arrangement of the vibration sensors. Furthermore, the forming method of the mounting holes 112 is not limited; for example, they can be integrally formed by machining or casting.

[0060] In some embodiments, the integrated substrate 11 may be provided with a plurality of mounting holes 112, and a fastener may be inserted into each mounting hole 112. The fastener is fastened to the valve box 021 to ensure the reliability of the connection between the spacer 10 and the valve box 021.

[0061] Optionally, the support sleeve 13 may also be provided with a through hole, which is arranged opposite to the corresponding mounting hole 112 to facilitate the insertion of fasteners.

[0062] refer to Figure 2 , Figure 4 , Figure 6 and Figure 7The integrated substrate 11 may also have multiple packing box through holes 113 for mounting packing boxes, and the packing box through holes 113 are arranged adjacent to the mounting holes 112. Optionally, the integrated substrate 11 may have multiple packing box through holes 113 arranged along a first direction. It should be noted that a piston can be inserted into the packing box through hole 113, and the packing box achieves a seal between the piston and the packing box through hole 113.

[0063] In some more specific embodiments, a plurality of mounting holes 112 may be arranged along a first direction on an integral substrate 11, and in the first direction, each packing box through hole 113 is located in the area between two adjacent mounting holes 112.

[0064] Considering the relatively thick casting material between the packing box through-hole 113 and the mounting hole 112, to alleviate the problem of casting defects caused by uneven cooling rate of the internal molten metal (e.g., molten iron) during the casting process, in this embodiment, an anti-shrinkage hole 114 can be provided in the area between two adjacent packing box through-holes 113 and mounting holes 112. Figure 2 and Figure 4 As shown, the anti-shrinkage hole 114 can ensure that the material wall thickness between the packing box through hole 113 and the mounting hole 112 is uniform, ensuring casting quality, and can also reduce weight.

[0065] It should be noted that the shape and number of anti-shrinkage holes 114 are not limited. They can be determined according to the relative position of the packing box through hole 113 and the mounting hole 112. For example, the anti-shrinkage holes 114 can be circular, rhomboid, triangular or any irregular casting shape.

[0066] In some more specific embodiments, the anti-shrinkage hole 114 can be an inverted triangle. This arrangement can further improve the uniformity of the material wall thickness among the mounting hole 112, the packing box through hole 113, and the anti-shrinkage hole 114. It should be noted that using an inverted triangle can make the wall thickness of the inner cavity of two adjacent packing box through holes 113 as similar as possible, alleviating the problem of failure at local weak points due to uneven stiffness of the inner cavity of the packing box through hole 113 during operation, and also improving the uniformity of stress on the inner cavity of the packing box through hole 113.

[0067] Considering that the protruding root of the packing mounting position of each cylinder of the hydraulic end assembly 02 has a large transition radius, making it impossible for the integrated base plate 11 and the valve box 021 to fully fit at the root bend, based on this, in this embodiment, the side of the integrated base plate 11 facing the valve box 021 can also be provided with a clearance groove 115, such as... Figure 4 As shown, multiple packing box through holes 113 are respectively opened at the bottom of the relief groove 115, so that the integrated substrate 11 does not contact the protruding root turning point, and can also play a role in weight reduction.

[0068] Optionally, the clearance groove 115 can be a long groove, that is, composed of two arc surfaces and two tangent horizontal surfaces. Of course, it is not limited to this and can also be other shapes, as long as the integral substrate 11 does not contact the turning point of the protruding root.

[0069] To prevent external rainwater or abnormally leaked fracturing fluid from flowing into and accumulating in the relief groove 115, in this embodiment of the application, a drainage groove 116 may be provided on the side of the integrated base plate 11 facing the valve box 021. The relief groove 115 can be connected to the outside through the drainage groove 116, so that water leaking into the relief groove 115 can be discharged through the drainage groove 116 to prevent water accumulation in the relief groove 115.

[0070] Optionally, the drainage channel 116 can be located at the lower position of the relief channel 115; in addition, the shape, quantity, and forming method of the drainage channel 116 are not limited, and it can be formed by machining or casting.

[0071] refer to Figure 5 In some embodiments, a drainage groove 116 may be provided in the area of ​​the integrated substrate 11 near the valve box 021, and the drainage groove 116 extends along a first direction. Based on this arrangement, under the guiding and draining effect of the drainage groove 116, rainwater or leaked fracturing fluid can flow out from both sides of the integrated substrate 11 through the drainage groove 116, so as to prevent excessive rainwater or fracturing fluid from flowing to the plunger through the weight reduction groove 111 and affecting the lubrication of the packing.

[0072] To further improve drainage, the middle section of the drainage trough 116 is higher than the two ends, that is, the middle is high and the two ends are low. It extends downward from the middle high point along a constant or variable slope to both ends, which is conducive to draining accumulated water.

[0073] Optionally, the cross-section of the drainage channel 116 can be rectangular, or of course, other shapes, which are not specifically limited here.

[0074] refer to Figure 1 In some embodiments, the power end assembly 01 may further include a crosshead box 20 connected to the spacer 10. Accordingly, a connecting end plate 12 may be provided on the side of the spacer 10 facing the crosshead box 20, and the connecting end plate 12 may be provided with positioning pin holes 121 on both sides in the first direction. The positioning pin holes 121 are used to adjust the relative position of the spacer 10 and the crosshead box 20 in the second direction. Based on the above configuration, the installation positioning between the spacer 10 and the crosshead box 20 can be achieved by the cooperation of the positioning pins and the positioning pin holes 121.

[0075] It should be noted that during the operation of the plunger pump, due to the gravity acting on the crosshead within the crosshead housing 20 and the clearance between the crosshead and the sliding sleeve of the crosshead housing 20, the crosshead and connecting rod are not concentric with the sliding sleeve of the crosshead housing 20 in the second direction. Therefore, by offsetting the locating pin hole 121 in the second direction, the position of the spacer 10 in the second direction can be adjusted, making the connecting rod oil seal coaxial with the connecting rod and compensating for the offset of the connecting rod in the second direction. The offset distance and direction are determined by the tolerances of the crosshead sliding sleeve, the crosshead, and the connecting rod during assembly.

[0076] By offsetting the positioning pin hole 121, the oil seal of the tie rod can be made coaxial with the tie rod, avoiding the influence of the tolerances during the assembly of the crosshead sleeve, crosshead, and tie rod on the coaxiality of the lip seal of the spacer 10 and the tie rod, reducing the wear of the tie rod on the lip seal, and improving the sealing performance inside the crosshead box 20.

[0077] In some embodiments, the positioning pin holes 121 are a set of two and arranged diagonally on both sides of the connecting end plate 12. Of course, the number and position of the positioning pin holes 121 are not limited, as long as they can achieve reliable positioning.

[0078] In addition, the integrated substrate 11 and the connecting end plate 12 can each be arranged with a set of two set screw thread holes in another diagonal direction. The specifications and number are not limited, which facilitates the disassembly of the spacer 10 and prevents the sealing surface from sticking together for a long time, which would make disassembly difficult.

[0079] refer to Figure 1 , Figure 5 and Figure 8 In some embodiments, the spacer 10 may further include a plurality of support sleeves 13, which are disposed on the side of the integral substrate 11 opposite to the valve box 021. Specifically, the plurality of support sleeves 13 are disposed between the integral substrate 11 and the connecting end plate 12.

[0080] Furthermore, the inner diameter at both ends of the support sleeve 13 is smaller than the inner diameter in the area between the two ends. Based on this design, by increasing the inner diameter in the area between the two ends of the support sleeve 13, the strength of the sand core during casting can be guaranteed, avoiding defects such as deformation or missing material in the casting due to insufficient sand core strength. By decreasing the inner diameter at both ends of the support sleeve 13, the wall thickness of the stress-bearing parts is guaranteed, improving the bending strength and support stiffness at the root of the support sleeve 13.

[0081] Optionally, the inner hole of the support sleeve 13 can be formed by machining or by casting.

[0082] Furthermore, the different inner diameter regions of the support sleeve 13 can be connected by fillet transition, and the radius of the fillet is not less than 0.5 times the wall thickness of the support sleeve 13.

[0083] In some embodiments, the connection between the support sleeve 13 and the integral substrate 11 or the connecting end plate 12 has a tapered structure, and the support sleeve 13 has a length with a small inner diameter that is greater than 3 / 4 of the length of the tapered structure.

[0084] refer to Figures 6 to 9 In some embodiments, the spacer 10 may be provided with a support leg 14 at the bottom along the second direction. The support leg 14 may include a first rib 141 and a second rib 142, both of which are wider at the top and narrower at the bottom, as well as a bottom plate. The first rib 141 extends along the first direction, the second rib 142 extends along the third direction, and the first rib 141 and the second rib 142 are connected.

[0085] Specifically, the first stiffener 141 is arranged parallel to the integral substrate 11 and connected to the integral substrate 11, and the connection between the first stiffener 141 and the integral substrate 11 extends at least beyond the second support sleeve 13 at the edge; the width of the connection gradually decreases downward along a fixed slope or a variable slope, connecting to the bottom plate, wherein the edge of the first stiffener 141 can be flush with the edge of the bottom plate.

[0086] The connection between the first stiffener 141 and the integral base plate 11 is made of rounded corners with a radius greater than R10, which improves the strength of the root of the first stiffener 141 and alleviates the stress concentration problem.

[0087] The second stiffener 142 is connected to the support sleeve 13. To ensure the stability of the support, the connection length between the second stiffener 142 and the support sleeve 13 is at least 1 / 3 of the length of the support sleeve 13. The width gradually decreases from the connection point downward along a fixed slope or a variable slope, connecting to the bottom plate. The edge of the first stiffener 141 can be flush with the edge of the bottom plate.

[0088] The first stiffening plate 141 and the second stiffening plate 142 are perpendicularly connected to form a triangular support leg 14. This not only improves the bending strength of the support leg 14, but also decomposes the vertically downward pressure into a horizontal thrust, thereby reducing the vertical support reaction force and lowering the pressure and bending moment at the support leg 14. Simultaneously, the first stiffening plate 141 and the second stiffening plate 142 are spatially perpendicular in the first and third directions. This spatial triangular support design improves the stability of the spacer frame 10 in the first and third directions, while also enhancing its torsional resistance.

[0089] Optionally, the thickness of the first stiffener 141 and the second stiffener 142 is not limited, as long as it can ensure the support strength and meet the casting process requirements.

[0090] Optionally, through holes can be formed in the middle of both the first stiffener 141 and the second stiffener 142 to effectively prevent stress concentration caused by mutual compression of nearby internal structures, thereby releasing internal stress and reducing structural weight. For example, the shape of the through holes can be similar to that of the first stiffener 141 and the second stiffener 142, such as a triangle, and the width of the edges of each of the first stiffener 141 and the second stiffener 142 must be greater than three times the stiffener thickness. Of course, the through holes can also be other shapes, as long as they do not excessively weaken the strength of the first stiffener 141 and the second stiffener 142.

[0091] In some embodiments, the spacer 10 may also be provided with auxiliary stiffeners, which may be connected between the first stiffener 141 and the integral substrate 11 or the connecting end plate 12, and may also be connected between the second stiffener 142 and the integral substrate 11 or the connecting end plate 12, and the auxiliary stiffeners are disposed away from the through holes.

[0092] The connection between the auxiliary stiffener and the integral base plate 11 or the connecting end plate 12 does not exceed the edge of the integral base plate 11 or the connecting end plate 12, and is connected downward to the first stiffener 141 or the second stiffener 142 with equal or varying slope, and the connection position is not restricted.

[0093] The base of the auxiliary stiffener can be rounded, with the radius greater than R10, which helps to improve the connection strength.

[0094] Considering that the power end assembly 01 and the hydraulic end assembly 02 are separated by a spacer 10, the central space of the spacer 10 (i.e., the space between the integrated base plate 11 and the connecting end plate 12) accommodates the reciprocating motion of the pull rod and piston. To avoid excessive wear between the reciprocating motion of the plunger and the sealing packing, lubricant, including grease or lubricating oil, is intermittently injected into the packing lubrication port. The lubricant forms a lubricating film between the sealing packing and the plunger, which reduces friction, prevents wear, and ensures a sealing effect. When the plunger movement frequency and the lubricant injection frequency are not perfectly matched, excess lubricant may be squeezed out from the gap between the sealing packing and the plunger.

[0095] Therefore, the powertrain assembly 01 may also include an oil tray 30, such as Figure 10 As shown, the oil receiving tray 30 is located below the spacer 10 and is used to collect the lubricating oil dripping from the spacer 10.

[0096] Optionally, the oil receiving tray 30 can be connected between two second stiffening plates 142 to ensure the stability of the oil receiving tray 30.

[0097] Considering that the viscosity of lubricants can be high or low, i.e., when the viscosity is high, the fluidity is poor or non-fluid, such as grease lubricants, while when the viscosity is low, the fluidity is good, such as oil lubricants.

[0098] When the lubricant is an oil-based lubricant, the oil receiving tray 30 may be provided with an oil outlet 31, and the bottom wall 1113 of the oil receiving tray 30 extends downwards at an angle toward the oil outlet 31 to facilitate the flow of the lubricant.

[0099] Optionally, the oil receiving tray 30 can be manufactured by bending and welding steel plates. The base plate of the oil receiving tray 30 can be made of a bent plate, with no limit on the thickness (e.g., ≥2mm). The cross-section of the base plate is higher at both ends and lower in the middle, using a constant or variable slope transition to facilitate the collection of lubricant drippings by gravity to the center of the base plate. It should be noted that the base plate is not limited to bending; it can also be formed by splicing steel plates, integral die casting, etc., as long as the base plate is leak-proof and has an automatic lubricant collection function.

[0100] Oil outlets 31 can be provided at any position on the oil receiving tray 30. The shape, size, and position of the oil outlets 31 are not limited, as long as they facilitate the smooth flow of lubricant. To save installation space and facilitate the arrangement of the oil outlet pipe, the oil outlets 31 can be arranged horizontally at the bottom of the side plate of the oil receiving tray 30, with the bottom plate at an angle to the horizontal direction. The oil outlets 31 are located at the lowest point, allowing the lubricant collected on the bottom plate to automatically flow out of the oil outlets 31. Optionally, the height difference of the bottom plates can be greater than 30mm. Where installation space allows, the greater the height difference, the faster the lubricant is discharged.

[0101] When the lubricant is a grease-based lubricant, in addition to the oil receiving pan 30, it may also include a scraper 40 and a drive rod 50, such as... Figure 11 As shown, the scraper 40 is slidably connected to the oil receiving plate 30 so that the scraper 40 can move closer to or further away from the oil outlet 31. The drive rod 50 is connected to the scraper 40 and is used to drive the scraper 40 to move.

[0102] It should be noted that grease-based lubricants have poor fluidity and cannot flow on their own, even on an inclined base plate, leading to lubricant accumulation and blockage of the oil outlet 31. Therefore, in this embodiment, the drive rod 50 moves the scraper 40 within the oil receiving pan 30, which can scrape the lubricant in the oil receiving pan 30 to the oil outlet 31.

[0103] Optionally, a guide rod may be provided inside the oil receiving pan 30, and the scraper 40 is slidably connected to the guide rod.

[0104] Considering that excessive accumulation of grease lubricant may easily cause the scraper 40 to jam, insufficient rigidity of the drive rod 50 or guide rod, and bending errors may easily cause the scraper 40 to have difficulty making close contact with the bottom of the oil receiving pan 30, making it difficult to achieve a clean and reliable oil scraping effect.

[0105] Based on the above, this application also proposes a drawer-type discharge structure, such as... Figure 12As shown, the bottom oil collecting part of the entire oil receiving tray 30 is designed as a removable drawer-type oil collecting box 60. The internal scraper 40 and the drawer-type oil collecting box 60 are fixed together by the scraper 40 bracket, such as by bolt connection, welding, riveting, etc.

[0106] The scraper 40 is fixed at half the length of the drawer-type oil collection box 60. Pulling out the oil collection box 60 from both sides ensures the stability of the pull-out process, saves operating space, and avoids the difficulty of operation caused by pulling out the entire oil collection box 60 from one side. Alternatively, depending on the actual operating conditions and space arrangement, the scraper 40 can be fixed at any point along the length of the oil box.

[0107] Unlike the oil receiving pan 30, the lowest point of the drawer-type oil collection box 60 in the length direction is not located at the oil outlet 31, but at the drain outlet, to drain rainwater or abnormally leaked fracturing fluid from the oil collection box 60.

[0108] Because grease lubricants are too viscous to be discharged through narrow channels, they can be removed directly with a shovel or other tools after being pulled out of the oil collection box 60.

[0109] The drawer-type oil collection box 60 not only facilitates the removal of lubricant, but also serves as a guide for the drive rod 50 and the guide rod. Since the oil collection box 60 is a cubic structure formed by bending and welding, its overall rigidity is far greater than that of the drive rod 50, guide rod and other slender rods, which greatly improves the stability and motion rigidity of the oil scraping part.

[0110] In addition, to compensate for the gap between the scraper 40 and the base plate, the scraper 40 can be designed as a sandwich structure of steel plate, rubber and steel plate. The number of sandwich layers is not limited to one layer. When the scraper 40 reciprocates, the rubber in the middle can compensate for the gap between the scraper 40 and the base plate and make direct contact with the base plate.

[0111] Of course, the interlayer between the two steel plates is not limited to rubber; any non-metallic material with a certain degree of flexibility and elasticity can be used.

[0112] To facilitate replacement of the middle interlayer after prolonged contact with lubricant, the layers can be connected by bolts, with no limit on the number of bolts, or by adhesive bonding.

[0113] The oil collection box 60 and the oil receiving tray 30 can be slidably connected, and the relative sliding method is not limited. Any relative sliding of the contact pair can be achieved by using a slide rail, slider, roller, or other means. In this application example, two L-shaped bent edges can be overlapped to achieve left and right limit and forward and backward sliding.

[0114] To avoid direct sliding friction between metals, a self-lubricating pad is added between the L-shaped edge of the oil receiving tray 30 and the L-shaped edge of the oil collection box 60. The material is not limited to nylon, PTFE, graphite, etc. During installation, yellow grease can be applied appropriately to ensure smooth sliding.

[0115] To facilitate replacement of the self-lubricating material after prolonged wear, the self-lubricating pad is connected to the L-shaped edge of the oil receiving pan 30 using countersunk bolts. After tightening, the countersunk bolts must not extend beyond the upper surface of the self-lubricating pad. The number of bolts is unlimited, or other connection methods such as adhesive bonding can be used. A limit plate is provided at one end of the oil collection box 60 for stable positioning when no pulling is required, preventing the oil collection box 60 from sliding and shifting due to vibrations during the operation of the plunger pump.

[0116] Due to the aforementioned sliding structure, the weight of the oil collection box 60 and the accumulated lubricant inside is borne by the L-shaped bent edges at both ends of the oil receiving tray 30. To improve the structural rigidity of the L-shaped bent edges, several L-shaped hook stiffeners are arranged along the length of the L-shaped bent edges. The connection between the L-shaped hook stiffeners and the oil collection box 60 and the L-shaped bent edges is not limited to welding, which can achieve a stable connection between the three and ensure that the L-shaped bent edges do not undergo oblique deformation when subjected to downward tension. This greatly improves the rigidity of the L-shaped bent structure and ensures the sliding accuracy and service life of the drawer oil collection box 60.

[0117] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A plunger pump, characterized in that, include: Power end assembly (01) and hydraulic end assembly (02); The power end assembly (01) includes a spacer (10), and an integral base plate (11) is provided on the side of the spacer (10) facing the hydraulic end assembly (02). The hydraulic end assembly (02) includes a valve box (021), and the integrated base plate (11) is detachably connected to the valve box (021).

2. The plunger pump according to claim 1, characterized in that, The integrated substrate (11) is provided with a plurality of mounting holes (112), and a fastener is inserted into each mounting hole (112), and the fastener is fastened to the valve box (021). The integrated base plate (11) has a plurality of weight-reducing grooves (111) on the side opposite to the valve box (021), and the weight-reducing grooves (111) are located between two adjacent mounting holes (112).

3. The plunger pump according to claim 2, characterized in that, The weight-reducing groove (111) includes two first sidewalls (1111), a second sidewall (1112), and a bottom wall (1113). The two first sidewalls (1111) are spaced apart in a first direction. The second sidewall (1112) is connected to the ends of the two first sidewalls (1111) along a second direction. The bottom wall (1113) is connected to the ends of the two first sidewalls (1111) and the second sidewall (1112) along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The extension direction of each of the first sidewalls (1111) forms a first angle with the second direction, the first angle ranging from 0° to 60°; The extension direction of each of the first sidewalls (1111) forms a second angle with the third direction, the second angle ranging from 0° to 45°; The second sidewall (1112) forms a third angle with the third direction, the third angle ranging from 0° to 30°.

4. The plunger pump according to claim 1, characterized in that, The integrated substrate (11) is provided with a plurality of mounting holes (112), and a fastener is inserted into each mounting hole (112), and the fastener is fastened to the valve box (021). The integrated substrate (11) is also provided with a plurality of packing box through holes (113), which are arranged adjacent to the mounting holes (112); An anti-slip hole (114) is provided in the area between two adjacent packing box through holes (113) and mounting holes (112).

5. The plunger pump according to claim 4, characterized in that, The integrated substrate (11) has a relief groove (115) on the side facing the valve box (021), and a plurality of packing box through holes (113) are respectively opened at the bottom of the relief groove (115).

6. The plunger pump according to claim 5, characterized in that, The integrated substrate (11) has a drainage groove (116) in the area near the valve box (021), the drainage groove (116) extends along a first direction, and the middle area of ​​the drainage groove (116) is higher than the two end areas. And / or, the side of the integrated substrate (11) facing the valve box (021) is also provided with a drainage groove (116), and the clearance groove (115) is connected to the outside through the drainage groove (116).

7. The plunger pump according to claim 1, characterized in that, The power end assembly (01) also includes a crosshead box (20) connected to the spacer (10). The spacer (10) has a connecting end plate (12) on the side facing the crosshead box (20). The connecting end plate (12) has positioning pin holes (121) on both sides in the first direction. The positioning pin holes (121) are used to adjust the relative position of the spacer (10) and the crosshead box (20) in the second direction.

8. The plunger pump according to claim 1, 2, or 7, characterized in that, The spacer (10) includes a plurality of support sleeves (13), which are located on the side of the integral base plate (11) away from the valve box (021). The inner diameter of the support sleeves (13) at both ends is smaller than the inner diameter of the area between the two ends.

9. The plunger pump according to claim 1, characterized in that, The power unit assembly (01) also includes an oil receiving tray (30), which is located below the spacer (10); The oil receiving tray (30) is provided with an oil outlet (31), and the bottom wall (1113) of the oil receiving tray (30) extends downward at an angle toward the oil outlet (31).

10. The plunger pump according to claim 1, characterized in that, The power end assembly (01) also includes an oil receiving pan (30), a scraper (40), and a drive rod (50). The oil receiving tray (30) is located below the spacer (10), and the oil receiving tray (30) is provided with an oil outlet (31). The scraper (40) is slidably connected to the oil receiving tray (30), and the scraper (40) can be close to or away from the oil outlet (31). The drive rod (50) is connected to the scraper (40) and is used to drive the scraper (40) to move.

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