Connecting system for plunger pump device

Abstract

A connecting system for a plunger pump device, comprising: a connecting member, comprising a shaft, and a first meshing portion and a second meshing portion provided at two opposite ends of the shaft; a reduction gearbox interface comprising a third meshing portion; and a plunger pump device interface comprising a fourth meshing portion. The first meshing portion meshes with the third meshing portion to form a first meshing pair, and the second meshing portion meshes with the fourth meshing portion to form a second meshing pair. The first meshing portion and the third meshing portion are respectively internal teeth and external teeth of the first meshing pair, or respectively external teeth and internal teeth of the first meshing pair. The second meshing portion and the fourth meshing portion are respectively internal teeth and external teeth of the second meshing pair, or respectively external teeth and internal teeth of the second meshing pair. The external teeth or internal teeth of the first meshing pair are designed as crowned teeth, and / or the external teeth or internal teeth of the second meshing pair are designed as crowned teeth. Other external teeth and internal teeth of the first meshing pair and the second meshing pair are designed as straight teeth. The present invention can reduce the tooth surface wear during operation.

Description

Connection system for plunger pump equipment

[0001] Citation of relevant applications

[0002] This application claims priority and benefits to Chinese Patent Application No. 202421187956.2, filed with the State Intellectual Property Office of the People's Republic of China on May 28, 2024, the entire contents of which are hereby incorporated herein by reference. Technical Field

[0003] This invention relates to a connection system for a plunger pump device, and more particularly to a connection system for connecting a gearbox to a plunger pump device to achieve power transmission. Background Technology

[0004] As is well known, in the field of oil piston pump equipment, power sources such as diesel engines and electric motors provide power input to the piston pump equipment via a gearbox. Typically, the gearbox-side splines on the gearbox and the piston pump-side splines on the piston pump equipment directly mesh to achieve power transmission between them.

[0005] During the meshing operation of a conventional spline, the teeth consist of straight internal and external teeth that mesh, and ideally, the contact surface between the internal and external teeth is a straight line. However, when a slight misalignment occurs during spline meshing, stress concentration occurs in the contact area. Furthermore, prolonged meshing leads to tooth surface wear, and in severe cases, cracks, pitting, and tooth breakage can occur, significantly reducing the lifespan of the spline. Summary of the Invention

[0006] In view of the above, the present invention provides a connection system for connecting a gearbox and a plunger pump to realize power transmission between the gearbox and the plunger pump. This connection system can eliminate the disadvantages of the prior art and bring other advantages at the same time.

[0007] A connection system for a plunger pump device according to the present invention includes: a connector comprising a shaft and a first engagement portion and a second engagement portion disposed at opposite ends of the shaft; a gearbox interface comprising a third engagement portion; and a plunger pump device interface comprising a fourth engagement portion. The first engagement portion engages with the third engagement portion to form a first engagement pair, and the second engagement portion engages with the fourth engagement portion to form a second engagement pair. The first engagement portion and the third engagement portion are respectively the internal and external teeth of the first engagement pair, or respectively the external and internal teeth of the first engagement pair. The second engagement portion and the fourth engagement portion are respectively the internal and external teeth of the second engagement pair, or respectively the external and internal teeth of the second engagement pair. The external or internal teeth of the first engagement pair are designed as drum-shaped teeth, and / or the external or internal teeth of the second engagement pair are designed as drum-shaped teeth. The other external and internal teeth of the first and second engagement pairs are designed as straight teeth.

[0008] According to a preferred embodiment, the dimensions of the second engagement portion are designed for a gearbox with a specific power rating.

[0009] According to a preferred embodiment, the shaft is designed as a straight shaft or a stepped shaft.

[0010] According to a preferred embodiment, the shaft is designed as a hollow shaft with an axial through hole.

[0011] According to a preferred embodiment, the connection system further includes a limiting mechanism fixed to one or both of the plunger pump device interface and the gearbox interface to limit the axial displacement of the connector between the plunger pump device interface and the gearbox interface.

[0012] According to a preferred embodiment, the limiting mechanism is an L-shaped plate and includes a first leg and a second leg perpendicular to the first leg. The shaft has a notch on its outer periphery, and the first leg is fixed to one or both of the plunger pump interface and the gearbox interface. The second leg is accommodated in the notch, thereby limiting the bidirectional displacement of the connector in the axial direction.

[0013] According to a preferred embodiment, the axial dimension of the recess is designed to be greater than the axial dimension of the second leg to provide the allowable axial displacement of the connector.

[0014] According to a preferred embodiment, the connection system further includes a limiting mechanism, which includes a stepped member and an auxiliary limiting member. The stepped member is fixed at the first end of the connector to limit the displacement of the connector in a first direction along the axial direction. The auxiliary limiting member is fixed at the second end of the connector opposite to the first end to limit the displacement of the connector in a second direction along the axial direction.

[0015] According to a preferred embodiment, the stepped member includes a body and a stepped portion with a radial dimension smaller than that of the body, the stepped portion being designed to have a specific axial thickness to provide the allowable axial displacement of the connector.

[0016] According to a preferred embodiment, the allowable axial displacement is 2 to 8 mm.

[0017] According to a preferred embodiment, the plunger pump device interface is a crankcase interface located on the crankcase of the plunger pump device. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation thereof.

[0019] Figure 1 shows a cross-sectional view of the connection system according to a first embodiment of the present invention.

[0020] Figure 2 shows a cross-sectional view of a connector in a connection system according to a first embodiment of the present invention.

[0021] Figure 3 shows a plan view of the connector in the connection system according to a first embodiment of the present invention.

[0022] Figure 4 shows an end view of a connector in a connection system according to a first embodiment of the present invention.

[0023] Figure 5 shows a perspective view of a connector in a connection system according to a first embodiment of the present invention.

[0024] Figure 6 shows a cross-sectional view of another example of a connector in a connection system according to a first embodiment of the present invention.

[0025] Figure 7 shows a plan view of another example of a connector in a connection system according to a first embodiment of the present invention.

[0026] Figure 8 shows an end view of another example of a connector in a connection system according to a first embodiment of the present invention.

[0027] Figures 9 and 10 show perspective views of another example of a connector in a connection system according to a first embodiment of the present invention.

[0028] Figure 11 shows a cross-sectional view of a connector in a connection system according to a second embodiment of the present invention.

[0029] Figure 12 shows an end view of a connector in a connection system according to a second embodiment of the present invention.

[0030] Figure 13 shows a perspective view of a connector in a connection system according to a second embodiment of the present invention.

[0031] Figure 14 shows a cross-sectional view of the connectors shown in Figures 2 to 5 in the state of engagement with the gearbox interface and the plunger pump equipment interface.

[0032] Figure 15 shows a cross-sectional view of the connectors shown in Figures 6 to 10 in the state of engagement with the gearbox interface and the plunger pump equipment interface.

[0033] Figure 16 shows a partial enlarged view of part A in Figure 15.

[0034] Figure 17 shows a separate stepped member used as a limiting member. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0036] First Embodiment

[0037] Figure 1 shows a cross-sectional view of the connection system according to a first embodiment of the present invention.

[0038] As shown in Figure 1, the connection system according to this embodiment includes a gearbox interface 1, a connector 2, and a plunger pump interface 3 on the plunger pump device. For example, the plunger pump interface 3 may be a crankcase interface on the crankcase that serves as the plunger pump device, such as an internal gear ring at the end of the crankshaft.

[0039] Additionally, Figure 2 shows a cross-sectional view of the connector 2 in the connection system according to this embodiment. Figure 3 shows a plan view of the connector 2 in the connection system according to this embodiment. Figure 4 shows an end view of the connector 2 in the connection system according to this embodiment. Figure 5 shows a perspective view of the connector 2 in the connection system according to this embodiment.

[0040] As shown in Figures 2 to 5, the connector 2 is designed to have a first engaging portion 22, a second engaging portion 24, and a shaft 26. The first engaging portion 22 and the second engaging portion 24 of the connector 2 are fixedly disposed at opposite ends of the shaft 26. In this embodiment, the first engaging portion 22 consists of teeth disposed on the outer circumference of the first end (left end in Figure 1) of the shaft 26. The second engaging portion 24 consists of teeth disposed on the outer circumference of the second end (right end in Figure 1) of the shaft 26. These teeth disposed on the outer circumference are referred to herein as external teeth.

[0041] To enable power transmission through engagement between the connector 2 and the gearbox interface 1 and the plunger pump interface 3, respectively, the gearbox interface 1 is designed with a gearbox engagement portion 12, and the plunger pump interface 3 is designed with a plunger pump engagement portion 32. Corresponding to the first engagement portion 22 and the second engagement portion 24 of the connector 2, both the gearbox engagement portion 12 of the gearbox interface 1 and the plunger pump engagement portion 32 of the plunger pump interface 3 are designed as teeth on the inner circumference of their respective interfaces. Specifically, each of the gearbox interface 1 and the plunger pump interface 3 may include a notch or a through hole, and the gearbox engagement portion 12 and the plunger pump engagement portion 32 may be correspondingly provided as teeth on the inner circumference of such a notch or through hole. These teeth on the inner circumference are referred to herein as internal teeth.

[0042] In this embodiment, as shown in Figures 2 to 5, shaft 26 is shown as a straight shaft. Shaft 26 is a rigid shaft, which enables power transmission between the first engagement portion 22 and the second engagement portion 24.

[0043] Additionally, to reduce weight, shaft 26 may also include an axial through-hole 25. For example, in Figure 2, the axial through-hole 25 extends from the left end of shaft 26 to the right end of shaft 26. That is, shaft 26 is in the form of a hollow shaft. For example, the ratio of the through-hole diameter to the tooth tip circle diameter is in the range of 0.6 to 0.8, and the ratio of the minimum wall thickness of shaft 26 to the tooth tip circle diameter is in the range of 0.06 to 0.15.

[0044] Furthermore, since the connector 2 is used in a plunger pump and thus transmits a very large torque, a large fillet radius of R10 to R20 can be used between the location of the meshing portions 22 and 24 on the shaft 26 and the surrounding area. The roughness of the fillet radius can be designed to be Ra0.8 to Ra3.2, and the connector 2 is machined by forging as a single piece, with a length-to-diameter ratio in the range of 0.5 to 1.

[0045] During operation of the plunger pump, the gearbox engagement portion 12 of the gearbox interface 1 engages with the first engagement portion 22 of the connector 2. In this case, the gearbox engagement portion 12 of the gearbox interface 1 and the first engagement portion 22 of the connector 2 form a first engagement pair.

[0046] Simultaneously, the plunger pump engagement portion 32 of the plunger pump device interface 3 engages with the second engagement portion 24 of the connector 2. In this case, the plunger pump engagement portion 32 of the plunger pump device interface 3 and the second engagement portion 24 of the connector 2 form a second engagement pair.

[0047] Thus, through the connection provided by connector 2, power from the power source can be transmitted to the piston pump device via the reduction gearbox. For example, in the context of this application, the piston pump device can be a device for a piston pump or a part of a piston pump. For example, the piston pump device can be a crankcase for a piston pump.

[0048] According to the present invention, in order to reduce tooth surface wear during operation, the first meshing portion 22 and the second meshing portion 24 of the gear connecting member 2, both of which are external teeth, are designed as drum-shaped teeth, and the gearbox meshing portion 12 of the gearbox interface 1, which is an internal tooth, and the plunger pump equipment meshing portion 32 of the plunger pump equipment interface 3, which is an internal tooth, are correspondingly designed as straight teeth. It is well known that when the tooth is a straight line in the working circle tangent, such a tooth is called a straight tooth. On the other hand, when the tooth has a curved tooth profile in the working circle tangent, such a tooth is called a drum-shaped tooth.

[0049] Therefore, the connection system according to this example employs a connection method in which spur teeth (e.g., the gearbox engagement portion 12 of the gearbox interface 1 and the plunger pump engagement portion 32 of the plunger pump device interface 3) mesh with drum-shaped teeth (e.g., the first engagement portion 22 and the second engagement portion 24 of the connector 2). When the two tooth surfaces of the spur teeth and the drum-shaped teeth have a slight misalignment angle, their contact surface does not change significantly. Therefore, under long-term meshing motion, the tooth surface contact is good, and the contact surface condition is greatly improved compared to the case of spur tooth meshing. Therefore, the connection system according to this embodiment does not experience extreme phenomena such as tooth breakage, cracking, and pitting, and only normal tooth surface wear occurs, resulting in a significantly improved service life.

[0050] Note that the technical term "engaging part" as used in this application should be interpreted broadly, and its scope may vary as technology develops. Specifically, an engaging part refers to a component used to achieve transmission between two mechanical parts. Each of the two mechanical parts has its own engaging part, and these engaging parts can mesh with each other to achieve mechanical transmission or meshing transmission. For example, in this invention, the engaging part can be implemented in the form of teeth.

[0051] Deformation examples of connectors

[0052] In different application scenarios, gearboxes of varying power are used to provide power input to fracturing equipment. However, the splines on the gearbox sides of gearboxes of different power ratings have inconsistent dimensions. Therefore, it is difficult to connect gearboxes of different power ratings to fracturing equipment within a single platform.

[0053] Figure 6 shows a cross-sectional view of another example of a connector in a connection system according to a first embodiment of the present invention. Figure 7 shows a plan view of another example of a connector in a connection system according to a first embodiment of the present invention. Figure 8 shows an end view of another example of a connector in a connection system according to a first embodiment of the present invention. Figures 9 and 10 show perspective views of another example of a connector in a connection system according to a first embodiment of the present invention.

[0054] The connector 2' in this example is a variation of the connector 2 described above.

[0055] The first engaging portion 22' of connector 2' can have the same dimensions (e.g., base circle diameter) as the first engaging portion 22 of connector 2, and therefore can also engage with the plunger pump device engaging portion 12 of the plunger pump device interface 1 shown in FIG. 1. However, the second engaging portion 24' of connector 2' has different dimensions (e.g., base circle diameter) than the second engaging portion 24 of connector 2, and therefore can be used for gearbox engaging portions of different sizes in gearbox interfaces for gearboxes of different power ratings. In this example, the dimensions of the second engaging portion 24' of connector 2' are smaller than the dimensions of the second engaging portion 24 of connector 2. That is, the dimensions of the second external teeth 24 and 24' of connectors 2 and 2' are designed and selected for a gearbox of a specific power rating.

[0056] In this case, as shown in Figures 6 and 7, shaft 26' is designed as a stepped shaft. Specifically, shaft 26' may include a large portion 261 and a small portion 262. The large portion 261 and the small portion 262 may each be a straight shaft, and they may be concentrically connected together or integrally formed concentrically. To accommodate the dimensions of the engaging portions 22' and 24', as shown in Figure 6, the radial dimension of the large portion 261 is larger than the radial dimension of the small portion 262.

[0057] The first engaging portion 22' of the connector 2' is provided as an external tooth on the outer circumference of the large-size portion 261. On the other hand, the second engaging portion 24' of the connector 2' is provided as an external tooth on the outer circumference of the end of the small-size portion 262 on the side opposite to the large-size portion.

[0058] Furthermore, in order to reduce the weight of the connector 2', as shown in FIG6, the axial dimension of the large-size portion 261 is much smaller than the axial dimension of the small-size portion 262. The axial dimension of the large-size portion 261 can be set such that the first engagement portion 22' of the connector 2' can be provided on the large-size portion 261.

[0059] Additionally, shaft 26' may also include a rounded transition portion 263. The transition portion 263 is provided at the boundary between the large-size portion 261 and the small-size portion 262 to reduce stress concentration.

[0060] For example, similar to the connector 2 shown in Figures 1 to 5, the connector 2' in this example may also include an axial through hole 25' to reduce the weight of the connector 2'.

[0061] Other aspects of this variation are the same as those of the examples shown in Figures 1 to 5.

[0062] Therefore, the connection system according to this embodiment allows for the connection of different gearboxes and piston pump devices within the same platform by directly replacing the corresponding connectors. This design facilitates the connection between different devices within the platform and provides assurance for the subsequent development of different gearboxes, thereby promoting platform-based development.

[0063] Second Embodiment

[0064] Figure 11 shows a cross-sectional view of the connector 4 in the connection system according to the second embodiment of the present invention. Figure 12 shows an end view of the connector 4 in the connection system according to the second embodiment of the present invention. Figure 13 shows a perspective view of the connector 4 in the connection system according to the second embodiment of the present invention.

[0065] As shown in Figures 11 to 13, the connector 4 is designed to have a first engaging portion 42, a second engaging portion 44, and a shaft 46. The first engaging portion 42 and the second engaging portion 44 of the connector 4 are fixedly disposed at opposite ends of the shaft 46. As in the first embodiment, in this embodiment, the shaft 46 may also be designed as a straight shaft.

[0066] Additionally, similar to the first embodiment, to reduce weight, the shaft 46 may also include an axial through-hole 45. For example, in Figure 11, the axial through-hole 45 extends from the left end of the shaft 46 to the right end of the shaft 46. That is, the shaft 46 is in the form of a hollow shaft.

[0067] During operation of the plunger pump, the gearbox engagement portion (not shown) of the gearbox interface 1 engages with the first engagement portion 42 of the connector 4. In this case, the gearbox engagement portion of the gearbox interface 1 and the first engagement portion 42 of the connector 4 form a first engagement pair.

[0068] Simultaneously, the plunger pump engagement portion (not shown) of the plunger pump device interface 3 engages with the second engagement portion 44 of the connector 4. In this case, the plunger pump device engagement portion of the plunger pump device interface 3 and the second engagement portion 44 of the connector 4 form a second engagement pair.

[0069] In this embodiment, as shown in Figures 11 to 13, the first engagement portion 42 and the second engagement portion 44 of the connector 4 are both designed with internal teeth. In order to perform engagement, the gearbox engagement portion (not shown) of the gearbox interface 1 and the plunger pump engagement portion (not shown) of the plunger pump device interface 3 are respectively designed with external teeth.

[0070] In addition, preferably, the length-to-diameter ratio of the connector 4 can be 0.5 to 1, and the ratio of the outer diameter of the connector 4 to the tooth tip circle diameter can be in the range of 1.1 to 1.3.

[0071] According to the present invention, in order to reduce tooth surface wear during operation, the first meshing part 42 and the second meshing part 44 of the connector 4, which are internal teeth, are both designed as straight teeth, and the gearbox meshing part of the gearbox interface 1, which is an external tooth, and the plunger pump equipment meshing part of the plunger pump equipment interface 3, which is an external tooth, are both designed as drum-shaped teeth.

[0072] Therefore, the connection system according to this embodiment employs a connection method in which spur teeth (e.g., the first meshing portion 42 and the second meshing portion 44 of the connector 4) mesh with drum-shaped teeth (e.g., the gearbox meshing portion of the gearbox interface 1 and the plunger pump equipment meshing portion of the plunger pump equipment interface 3). When the two tooth surfaces of the spur teeth and the drum-shaped teeth have a slight misalignment angle, their contact surface does not change significantly. Therefore, under long-term meshing motion, the tooth surface contact is good, and the contact surface condition is greatly improved compared to the case of spur tooth meshing. Therefore, the connection system according to this embodiment does not experience extreme phenomena such as tooth breakage, cracking, and pitting, and only normal tooth surface wear occurs, resulting in a significantly improved service life.

[0073] Furthermore, the dimensions of the second engaging portion 44 of the connector 4 can also be designed and selected for a gearbox with a specific power rating. In this case, the shaft 46 can be designed as a stepped shaft.

[0074] Other aspects of this embodiment are the same as those of the first embodiment.

[0075] Therefore, the connection system according to this embodiment allows for the connection of different gearboxes and piston pump devices within the same platform by directly replacing the corresponding connectors. This design facilitates the connection between different devices within the platform and provides assurance for the subsequent development of different gearboxes, thereby promoting platform-based development.

[0076] Other variations

[0077] The above embodiments illustrate the case where the external teeth in the first and second meshing pairs are both designed as drum-shaped teeth and the internal teeth are both designed as straight teeth; however, the present invention is not limited to these cases.

[0078] According to an improved example as a variation, for example, in the first and second meshing pairs, the external teeth may both be designed as straight teeth, and the internal teeth may both be designed as drum-shaped teeth.

[0079] Alternatively, according to an improved example as a variation, for example, in the first meshing pair, the external teeth may be designed as straight teeth and the internal teeth may be designed as drum-shaped teeth, while in the second meshing pair, the external teeth may be designed as drum-shaped teeth and the internal teeth may be designed as straight teeth.

[0080] Alternatively, according to an improved example as a variation, for example, in the first meshing pair, the external teeth may be designed as drum-shaped teeth and the internal teeth may be designed as straight teeth, while in the second meshing pair, the external teeth may be designed as straight teeth and the internal teeth may be designed as drum-shaped teeth.

[0081] Alternatively, according to an improved example as a variation, in one of the first and second meshing pairs, the external teeth may be designed as drum-shaped teeth and the internal teeth may be designed as straight teeth, while in the other meshing pair, both the external and internal teeth are designed as straight teeth.

[0082] Alternatively, according to an improved example as a variation, in one of the first and second meshing pairs, the external teeth may be designed as straight teeth and the internal teeth as drum-shaped teeth, while in the other meshing pair, both the external and internal teeth are designed as straight teeth.

[0083] Therefore, the connection system according to these improved examples adopts a connection method in which straight teeth and drum-shaped teeth mesh, and thus can achieve the same technical effect as the above embodiments.

[0084] Limiting mechanism

[0085] During the operation of the plunger pump, in the examples shown in Figures 2 to 5, the connector 2 may experience excessive axial movement between the gearbox interface 1 and the plunger pump interface 3. When the connector is biased to one side, the actual contact area of ​​the drum teeth becomes narrower, thus affecting the contact strength. Therefore, axial limiting needs to be considered.

[0086] Figure 14 shows a cross-sectional view of the connector 2 shown in Figures 2 to 5 in the state of engagement with the gearbox interface 1 and the plunger pump device interface 3.

[0087] As shown in Figure 14, a limiting mechanism is fixed on the plunger pump equipment interface 3. The limiting mechanism is, for example, in the form of an L-shaped plate 5. For example, one of the two legs 51 of the L-shaped plate 5 is fixed to the plunger pump equipment interface 3 by bolts.

[0088] Additionally, a recess 27 is provided on the outer circumference of the shaft 26 between the two engaging portions 22 and 24 of the connector 2. The other leg 52 of the two legs of the L-shaped plate 5, which is perpendicular to the leg 51, is non-fixedly accommodated in the recess 27.

[0089] The axial dimensions of the legs 52 of the L-shaped plate 5 and the axial dimensions of the recess 27 are set such that the legs 52 can be displaced within the recess 27 in the axial direction with a certain amount of axial displacement. The axial direction is the horizontal direction in Figure 5. For example, the axial dimension of the recess 27 can be slightly larger than the axial dimension of the legs 52 of the L-shaped plate 5 to provide the allowable axial displacement of the connector 2. The allowable axial displacement can be, for example, 2 to 8 mm. That is, the axial displacement of the L-shaped plate 5 is limited by the shape of the recess 27 so that the axial displacement of the L-shaped plate 5 within the recess 27 always falls within the allowable axial displacement.

[0090] In the example shown in Figure 14, the L-shaped plate 5 is fixed to the plunger pump device interface 3. However, the present invention is not limited to this fixing method; for example, the L-shaped plate 5 can also be fixed to the gearbox interface 1 or simultaneously to both the gearbox interface 1 and the plunger pump device interface 3.

[0091] By setting a limiting mechanism, excessive axial movement of the connecting piece 2 between the gearbox interface 1 and the plunger pump equipment interface 3 can be prevented.

[0092] Although the L-shaped plate type limiting mechanism was illustrated using connector 2 as an example, the L-shaped plate type limiting mechanism can also be appropriately applied to connectors in other examples or variations. Since the operating mechanism is exactly the same, it will not be described in detail here.

[0093] The above illustrates an example of limiting the axial displacement of a connector by setting a limiting mechanism in the middle of the connector. However, the axial displacement of a connector can also be limited by setting limiting mechanisms on both sides of the connector.

[0094] Figure 15 shows a cross-sectional view of the connector 2' shown in Figures 6 to 10 in the state of engagement with the gearbox interface (not shown) and the plunger pump device interface 3.

[0095] As shown in Figure 15, one or more stepped members 61 are fixed at the right end of the connector 2' (specifically, the plunger pump equipment interface side end) to limit the leftward displacement of the connector 2' in the axial direction. Two stepped members 61 can be seen in Figure 6. For example, the stepped members 61 can be bolted into threaded holes on the circumference of the end side of the connector 2'. Of course, the fixing of the stepped members 61 to the connector 2' is not limited to screws; other detachable connections or fixations can also be made.

[0096] Figure 16 shows a partial enlarged view of part A in Figure 15.

[0097] Additionally, one or more auxiliary limiting members 62 are provided at the left end of the connector 2' (specifically, the gearbox interface side end of the connector 2') to limit the rightward displacement of the connector 2' in the axial direction. Specifically, a step 28 is provided at the transition portion between the shaft 26' of the connector 2' and the gearbox interface side end, such that the step 28 together with the plunger pump equipment interface 3 forms a recess to accommodate the auxiliary limiting member 62. In Figure 6, the left end of the auxiliary limiting member 62 abuts against the step 28, and the right end abuts against the plunger pump equipment interface 3, thereby limiting the rightward displacement of the connector 2' in the axial direction.

[0098] By combining the stepped member 61 and the auxiliary limiting member 62, a limiting effect similar to that of the limiting mechanism in the fourth embodiment can be achieved.

[0099] Figure 17 shows a separate stepped member 61. As shown, the stepped member 61 includes a body 611 and a step portion 612 with a radial dimension smaller than that of the body 611. The axial thickness of the step portion 612 can be set, for example, to 2 to 8 mm, thereby achieving an allowable axial displacement of, for example, 2 to 8 mm for the connector 2'.

[0100] By setting a limiting mechanism including a stepped member 61 and an auxiliary limiting member 62, excessive axial movement of the connecting member 2' between the gearbox interface 1 and the plunger pump equipment interface 3 can be prevented.

[0101] Although the case of a limiting structure including a stepped member 61 and an auxiliary limiting member 62 was illustrated using connector 2' as an example, the limiting mechanism including the stepped member 61 and the auxiliary limiting member 62 can also be appropriately applied to connectors in other examples and variations. Since the operating mechanism is exactly the same, it will not be described in detail here.

[0102] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A connection system for a plunger pump device, characterized in that, include: Connector (2; 2'; 4), which includes a shaft (26; 26'; 46) and a first engaging portion (22; 22'; 42) and a second engaging portion (24; 24'; 46) disposed at opposite ends of the shaft (26; 26'; 46). 44)； The gearbox interface (1) includes a third engagement part (12); as well as The plunger pump equipment interface (3) includes a fourth engagement part (32). The first meshing portion (22; 22'; 42) meshes with the third meshing portion (12) to form a first meshing pair, and the second meshing portion (24; 24'; 44) meshes with the fourth meshing portion (32) to form a second meshing pair. The first meshing portion (22; 22'; 42) and the third meshing portion (12) are respectively the internal teeth and external teeth of the first meshing pair, or respectively the external teeth and internal teeth of the first meshing pair. The second meshing portion (24; 24'; 44) and the fourth meshing portion (32) are respectively the internal teeth and external teeth of the second meshing pair, or respectively the external teeth and internal teeth of the second meshing pair. The outer or inner teeth of the first meshing pair are designed as drum-shaped teeth, and / or the outer or inner teeth of the second meshing pair are designed as drum-shaped teeth, and The other external and internal teeth of the first meshing pair and the second meshing pair are designed as straight teeth.

2. The connection system according to claim 1, characterized in that, The dimensions of the second engagement portion (24; 24'; 44) are designed for a gearbox with a specific power rating.

3. The connection system according to claim 1, characterized in that, The shafts (26; 26'; 46) are designed as straight shafts or stepped shafts.

4. The connection system according to claim 1, characterized in that, The shaft (26; 26'; 46) is designed as a hollow shaft with axial through holes (25; 25'; 45).

5. The connection system according to claim 1, characterized in that, It also includes a limiting mechanism (5) fixed to one or both of the plunger pump equipment interface (3) and the gearbox interface (1) to limit the axial displacement of the connector (2; 2'; 4) between the plunger pump equipment interface (3) and the gearbox interface (1).

6. The connection system according to claim 5, characterized in that, The limiting mechanism (5) is an L-shaped plate and includes a first leg (51) and a second leg (52) perpendicular to the first leg (51). The shaft (26; 26'; 46) has a notch (27) on its outer periphery, and The first support leg (51) is fixed to one or both of the plunger pump equipment interface (3) and the gearbox interface (1), and The second leg (52) is received in the recess (27) to restrict the connector (2; 2'; 4) Bidirectional displacement along the axial direction.

7. The connection system according to claim 6, characterized in that, The axial dimension of the recess (27) is designed to be larger than that of the second leg (52) to provide the allowable axial displacement of the connector (2; 2'; 4).

8. The connection system according to claim 1, characterized in that, It also includes a limiting mechanism. The limiting mechanism includes a stepped component (61) and an auxiliary limiting component (62). The stepped member (61) is fixed at the first end of the connector (2; 2'; 4) to limit the displacement of the connector (2; 2'; 4) in a first direction along the axial direction. The auxiliary limiting member (62) is fixed at the second end of the connector (2; 2'; 4) opposite to the first end to limit the displacement of the connector (2; 2'; 4) in the second direction along the axial direction.

9. The connection system according to claim 8, characterized in that, The stepped member (61) includes a body (611) and a stepped portion (612) with a radial dimension smaller than that of the body (611). The stepped portion (612) is designed to have a specific axial thickness to provide the allowable axial displacement of the connector (2; 2'; 4).

10. The connection system according to claim 7 or 9, characterized in that, The allowable axial displacement is 2 to 8 mm.

11. The connection system according to claim 1, characterized in that, The plunger pump equipment interface (3) is a crankcase interface located on the crankcase of the plunger pump equipment.

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