Connection system for plunger pump device

Abstract

A connection system for a plunger pump apparatus includes: a connector including a shaft and first and second meshing portions disposed at opposite ends of the shaft; comprising a third meshing part; and the plunger pump equipment interface comprises a fourth meshing part. 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 and third meshing portions are inner and outer teeth of the first meshing pair, respectively, or outer and inner teeth of the first meshing pair, respectively. And the second meshing part and the fourth meshing part are inner teeth and outer teeth of the second meshing pair respectively, or are outer teeth and inner teeth of the second meshing pair respectively. The outer or inner teeth of the first meshing pair are designed as crowned teeth and / or the outer or inner teeth of the second meshing pair are designed as crowned teeth. The other external and internal teeth of the first and second meshing pairs are designed as straight teeth. According to the utility model, the tooth surface abrasion during the operation period can be reduced.

Description

Technical Field

[0001] The utility model relates to a connection system for a plunger pump device, in particular to a connection system for connecting a reduction box to the plunger pump device to realize power transmission. Background Art

[0002] As is known to all, in the field of petroleum plunger pump equipment, a power source such as a diesel engine or an electric motor provides power input to the plunger pump equipment via a reduction gearbox. Usually, a reduction gearbox side spline provided on the reduction gearbox and a plunger pump equipment side spline provided on the plunger pump equipment are directly meshed to achieve power transmission therebetween.

[0003] During the meshing operation of ordinary splines, the teeth are meshed with straight inner teeth and straight outer teeth, and under ideal conditions, the contact surface between the inner and outer teeth is a straight line. However, when the spline meshes with a slight deflection angle, this will cause stress concentration in the contact area. Moreover, long-term meshing will cause wear on the tooth surface, and in severe cases, cracks, pitting, broken teeth, etc. will occur, which will greatly reduce the life of the spline. Utility Model Content

[0004] In view of the above situation, the utility model provides a connection system for connecting a reduction box and a plunger pump device to achieve power transmission between the reduction box and the plunger pump device, which can eliminate the shortcomings of the above-mentioned prior art and bring other advantages at the same time.

[0005] The connection system for a plunger pump device according to the utility model includes: a connecting member, which includes a shaft and a first meshing portion and a second meshing portion arranged at opposite ends of the shaft; a reduction box interface, which includes a third meshing portion; and a plunger pump device interface, which includes 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 the inner teeth and outer teeth of the first meshing pair, or respectively the outer teeth and inner teeth of the first meshing pair. The second meshing portion and the fourth meshing portion are respectively the inner teeth and outer teeth of the second meshing pair, or respectively the outer teeth and inner teeth of the second meshing pair. The outer teeth or inner teeth of the first meshing pair are designed as drum teeth, and / or the outer teeth or inner teeth of the second meshing pair are designed as drum teeth. The other outer teeth and inner teeth of the first meshing pair and the second meshing pair are designed as straight teeth.

[0006] According to a preferred embodiment, the size of the second meshing portion is designed for a reduction gearbox of a specific power.

[0007] According to a preferred embodiment, the shaft is designed in the form of a straight shaft or a stepped shaft.

[0008] According to a preferred embodiment, the shaft is designed as a hollow shaft with an axial through hole.

[0009] According to a preferred embodiment, the connection system also includes a limiting mechanism fixed on one or both of the plunger pump device interface and the reduction gearbox interface to limit the axial displacement of the connecting member between the plunger pump device interface and the reduction gearbox interface.

[0010] 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 is provided with a recess on the outer periphery, and the first leg is fixed to one or both of the plunger pump device interface and the reduction gearbox interface, and the second leg is accommodated in the recess, thereby limiting the bidirectional displacement of the connecting member along the axial direction.

[0011] According to a preferred embodiment, the axial dimension of the recess is designed to be larger than the axial dimension of the second leg, so as to increase the allowable axial displacement of the connecting member.

[0012] According to a preferred embodiment, the connection system also includes a limiting mechanism, which includes a stepped member and an auxiliary limiting member, wherein the stepped member is fixed at the first end of the connection member to limit the displacement of the connection member in a first direction along the axial direction, and the auxiliary limiting member is fixed at the second end of the connection member opposite to the first end to limit the displacement of the connection member in a second direction along the axial direction.

[0013] According to a preferred embodiment, the stepped member comprises a body and a step portion having a radial dimension smaller than that of the body, and the step portion is designed to have a specific axial thickness to increase the allowable axial displacement of the connecting member.

[0014] According to a preferred embodiment, the allowable axial displacement is 2 to 8 mm.

[0015] According to a preferred embodiment, the plunger pump device interface is a crankcase interface arranged on a crankcase of the plunger pump device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their description are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0017] Figure 1 A cross-sectional view of a connection system according to a first embodiment of the present invention is shown.

[0018] Figure 2A cross-sectional view of a connecting member in a connecting system according to a first embodiment of the utility model is shown.

[0019] Figure 3 A plan view showing a connecting member in a connecting system according to a first embodiment of the utility model.

[0020] Figure 4 An end view of a connecting member in a connecting system according to a first embodiment of the utility model is shown.

[0021] Figure 5 A perspective view of a connecting member in a connecting system according to a first embodiment of the utility model is shown.

[0022] Figure 6 A cross-sectional view showing another example of a connecting member in the connecting system according to the first embodiment of the present utility model.

[0023] Figure 7 A plan view showing another example of a connecting member in the connecting system according to the first embodiment of the present utility model.

[0024] Figure 8 An end view of another example of a connecting member in the connecting system according to the first embodiment of the present invention is shown.

[0025] Fig. 9 and Fig.10 A perspective view showing another example of a connecting piece in the connecting system according to the first embodiment of the utility model.

[0026] Fig.11 A cross-sectional view of a connecting member in a connecting system according to a second embodiment of the utility model is shown.

[0027] Fig.12 An end view of a connecting member in a connecting system according to a second embodiment of the utility model is shown.

[0028] Fig.13 A perspective view of a connecting member in a connecting system according to a second embodiment of the utility model is shown.

[0029] Fig.14 Shows Figures 2 to 5 The connecting member shown is a cross-sectional view of the state in which it is engaged with the reduction gearbox interface and the plunger pump device interface.

[0030] Fig.15 Shows Figures 6 to 10 The connecting member shown is a cross-sectional view of the state in which it is engaged with the reduction gearbox interface and the plunger pump device interface.

[0031] Fig.16 Shows Fig.15A partial enlarged view of part A.

[0032] Fig.17 A separate stepped piece is shown that acts as a stop. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0034] First embodiment

[0035] Figure 1 A cross-sectional view of a connection system according to a first embodiment of the present invention is shown.

[0036] like Figure 1 As shown, the connection system according to this embodiment includes a reduction gearbox interface 1 provided on the reduction gearbox, a connector 2, and a plunger pump device interface 3 provided on the plunger pump device. For example, the plunger pump device interface 3 may be a crankcase interface provided on a crankcase serving as a plunger pump device, such as an inner gear ring at the end of a crankshaft.

[0037] in addition, Figure 2 A cross-sectional view of a connection member 2 in a connection system according to the present embodiment is shown. Figure 3 A plan view of a connection member 2 in a connection system according to the present embodiment is shown. Figure 4 An end view of a connector 2 in a connection system according to the present embodiment is shown. Figure 5 A perspective view of a connection member 2 in a connection system according to the present embodiment is shown.

[0038] like Figures 2 to 5 As shown in FIG. 1 , the connecting member 2 is designed to have a first meshing portion 22, a second meshing portion 24 and a shaft 26. The first meshing portion 22 and the second meshing portion 24 of the connecting member 2 are fixedly arranged at opposite ends of the shaft 26. In this embodiment, the first meshing portion 22 is arranged at the first end ( Figure 1 The second meshing portion 24 is provided at the second end portion ( Figure 1 The teeth arranged on the outer circumference are referred to as external teeth in this article.

[0039] In order to achieve the engagement of the connecting member 2 with the reduction box interface 1 and the plunger pump device interface 3 respectively for power transmission, the reduction box interface 1 is designed to have a reduction box meshing portion 12, and the plunger pump device interface 3 is designed to have a plunger pump device meshing portion 32. In a manner corresponding to the first meshing portion 22 and the second meshing portion 24 of the connecting member 2, the reduction box meshing portion 12 of the reduction box interface 1 and the plunger pump device meshing portion 32 of the plunger pump device interface 3 are both designed to be teeth arranged on the inner circumference of the corresponding interface. Specifically, each of the reduction box interface 1 and the plunger pump device interface 3 may include a recess or a through hole, and the reduction box meshing portion 12 and the plunger pump device meshing portion 32 may be correspondingly arranged as teeth on the inner circumference of such a recess or a through hole. Such teeth arranged on the inner circumference are referred to as inner teeth in this article.

[0040] In this embodiment, if Figures 2 to 5 As shown, the shaft 26 is shown in the form of a straight shaft. The shaft 26 is a rigid shaft that can achieve power transmission between the first meshing portion 22 and the second meshing portion 24.

[0041] In addition, in order to reduce weight, the shaft 26 may further include an axial through hole 25. For example, Figure 2 In the embodiment, the axial through hole 25 penetrates from the left end of the shaft 26 to the right end of the shaft 26. That is, the 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 the shaft 26 to the tooth tip circle diameter is in the range of 0.06 to 0.15.

[0042] In addition, since the connector 2 is applied to a plunger pump device and thus transmits a very large torque, a large fillet R10 to R20 transition can be used between the position where the meshing portions 22 and 24 are provided and the nearby area of ​​the shaft 26. The roughness of the fillet can be designed to be Ra0.8 to Ra3.2, and the connector 2 is processed by forging integral molding, and the aspect ratio can be in the range of 0.5 to 1.

[0043] During operation of the plunger pump device, the gearbox engagement portion 12 of the gearbox interface 1 is engaged with the first engagement portion 22 of the connecting member 2. In this case, the gearbox engagement portion 12 of the gearbox interface 1 and the first engagement portion 22 of the connecting member 2 form a first engagement pair.

[0044] At the same time, the piston pump device engagement portion 32 of the piston pump device interface 3 engages with the second engagement portion 24 of the connecting piece 2. In this case, the piston pump device engagement portion 32 of the piston pump device interface 3 and the second engagement portion 24 of the connecting piece 2 form a second engagement pair.

[0045] Thus, through the connection provided by the connector 2, power from the power source can be transmitted to the plunger pump device via the reduction box. For example, in the sense of the present application, the plunger pump device can be a device for a plunger pump or a part of a plunger pump. For example, the plunger pump device can be a crankcase for a plunger pump.

[0046] According to the utility model, in order to reduce the wear of the tooth surface during operation, the first meshing portion 22 and the second meshing portion 24 of the gear coupling 2, both of which are external teeth, are designed as drum teeth, and the gearbox meshing portion 12 of the gearbox interface 1, which is an internal tooth, and the plunger pump device meshing portion 32 of the plunger pump device interface 3, which is an internal tooth, are correspondingly designed as straight teeth. As is well known, when the teeth are straight lines in the working circle section, such teeth are called straight teeth. On the other hand, when the teeth are curved tooth profiles in the working circle section, such teeth are called drum teeth.

[0047] Therefore, the connection system according to this example adopts a connection method in which straight teeth (for example, the reducer meshing portion 12 of the reducer interface 1 and the plunger pump device meshing portion 32 of the plunger pump device interface 3) are meshed with drum teeth (for example, the first meshing portion 22 and the second meshing portion 24 of the connector 2). When the two tooth surfaces of the straight teeth and the drum teeth have a slight deflection angle, their contact surfaces will not change greatly, so under long-term meshing movement, the tooth surfaces are in good contact, and compared with the case of straight tooth meshing, the contact surface condition is greatly improved. Therefore, the connection system according to this embodiment will not have extreme phenomena such as broken teeth, cracks and pitting, and only has normal tooth surface wear, which greatly improves the service life.

[0048] Note that the technical term "meshing part" used in this application should be understood in a broad sense, and its scope may change according to the development of technology. Specifically, the meshing part refers to a component used to realize transmission between two mechanical parts. The two mechanical parts have their own meshing parts, and these meshing parts can mesh with each other to realize mechanical transmission or meshing transmission. For example, in the present utility model, the meshing part can be realized in the form of teeth.

[0049] Variations of Connectors

[0050] In different application scenarios, there are cases where different power reduction gearboxes are used to realize the power input of the power source to the fracturing equipment. However, the reduction gearbox side splines of reduction gearboxes of different powers have the problem of inconsistent sizes. Therefore, it is difficult to realize the connection between reduction gearboxes of different powers and fracturing equipment in the platform.

[0051] Figure 6 A cross-sectional view showing another example of a connecting member in the connecting system according to the first embodiment of the present utility model. Figure 7A plan view showing another example of a connecting member in the connecting system according to the first embodiment of the present utility model. Figure 8 An end view of another example of a connecting member in the connecting system according to the first embodiment of the present invention is shown. Fig. 9 and Fig.10 A perspective view showing another example of a connecting member in the connecting system according to the first embodiment of the utility model.

[0052] The connecting member 2 ′ according to this example is a modified example of the connecting member 2 described above.

[0053] The first engagement portion 22' of the connecting member 2' may have the same size (eg, base circle diameter) as the first engagement portion 22 of the connecting member 2, and thus may also be used with the first engagement portion 22' of the connecting member 2. Figure 1 The plunger pump device interface 1 shown is engaged with the plunger pump device meshing portion 12. However, the second meshing portion 24' of the connecting member 2' has a different size (e.g., base circle diameter) than the second meshing portion 24 of the connecting member 2, and is therefore capable of being used for reducer meshing portions of different sizes of reducer interfaces of reducers of different powers. In this example, the size of the second meshing portion 24' of the connecting member 2' is smaller than the size of the second meshing portion 24 of the connecting member 2. That is, the sizes of the second external teeth 24 and 24' of the connecting members 2 and 2' are designed and selected for a reducer of a specific power.

[0054] In this case, if Figure 6 and Figure 7 As shown, the shaft 26' is designed in the form of a stepped shaft. Specifically, the shaft 26' may include a large-size portion 261 and a small-size portion 262. The large-size portion 261 and the small-size portion 262 may be in the form of straight shafts, and they are concentrically connected to each other or concentrically formed in one piece. In order to adapt the size of the meshing portions 22' and 24', as shown in FIG. Figure 6 As shown, the radial dimension of the large-size portion 261 is greater than the radial dimension of the small-size portion 262 .

[0055] The first meshing portion 22' of the connector 2' is provided as external teeth on the outer circumference of the large-sized portion 261. On the other hand, the second meshing portion 24' of the connector 2' is provided as external teeth on the outer circumference of the end of the small-sized portion 262 opposite to the large-sized portion.

[0056] In addition, in order to reduce the weight of the connecting member 2', as Figure 6 As shown, the axial dimension of the large-sized portion 261 is much smaller than that of the small-sized portion 262. The axial dimension of the large-sized portion 261 can be set so that the first meshing portion 22' of the connecting member 2' can be provided on the large-sized portion 261.

[0057] In addition, the shaft 26' may further include a transition portion 263 in the form of a rounded corner. 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.

[0058] For example, something like Figures 1 to 5 The connecting member 2 shown, the connecting member 2' in this example may also include an axial through hole 25' to reduce the weight of the connecting member 2'.

[0059] Other aspects of this modification are similar to Figures 1 to 5 The examples shown are the same.

[0060] Therefore, the connection system according to this embodiment allows different reduction gearboxes and plunger pump devices to be connected in the same platform by directly replacing the corresponding connecting parts. Thus, this design provides convenience for the connection between different devices in the platform and provides guarantee for the subsequent development of different reduction gearboxes, thereby promoting the development of platformization.

[0061] Second embodiment

[0062] Fig.11 A cross-sectional view of a connecting member 4 in a connecting system according to a second embodiment of the present utility model is shown. Fig.12 An end view of a connecting member 4 in a connecting system according to a second embodiment of the present invention is shown. Fig.13 A perspective view of a connecting member 4 in a connecting system according to a second embodiment of the present utility model is shown.

[0063] like Figures 11 to 13 As shown, the connecting member 4 is designed to have a first meshing portion 42, a second meshing portion 44 and a shaft 46. The first meshing portion 42 and the second meshing portion 44 of the connecting member 4 are fixedly arranged at opposite ends of the shaft 46. As in the first embodiment, in this embodiment, the shaft 46 can also be designed in the form of a straight shaft.

[0064] In addition, similar to the first embodiment, in order to reduce weight, the shaft 46 may further include an axial through hole 45. Fig.11 In the embodiment, the axial through hole 45 penetrates 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.

[0065] During operation of the plunger pump device, the gearbox engaging portion (not shown) of the gearbox interface 1 engages with the first engaging portion 42 of the connecting member 4. In this case, the gearbox engaging portion of the gearbox interface 1 and the first engaging portion 42 of the connecting member 4 form a first engaging pair.

[0066] At the same time, the piston pump device engagement portion (not shown) of the piston pump device interface 3 engages with the second engagement portion 44 of the connecting member 4. In this case, the piston pump device engagement portion of the piston pump device interface 3 and the second engagement portion 44 of the connecting member 4 form a second engagement pair.

[0067] In this embodiment, if Figures 11 to 13 As shown, the first meshing portion 42 and the second meshing portion 44 of the connecting member 4 are both designed as internal teeth. For meshing, the gearbox meshing portion (not shown) of the gearbox interface 1 and the plunger pump device meshing portion (not shown) of the plunger pump device interface 3 are both designed as external teeth accordingly.

[0068] In addition, preferably, the aspect ratio of the connecting member 4 may be 0.5 to 1, and the ratio of the outer diameter of the connecting member 4 to the addendum diameter may be in the range of 1.1 to 1.3.

[0069] According to the utility model, in order to reduce the tooth surface wear during operation, the first meshing portion 42 and the second meshing portion 44 of the connecting member 4 as internal teeth are both designed as straight teeth, and the reduction gearbox meshing portion of the reduction gearbox interface 1 as external teeth and the plunger pump equipment meshing portion of the plunger pump equipment interface 3 as external teeth are both correspondingly designed as drum teeth.

[0070] Therefore, the connection system according to the present embodiment adopts a connection method in which straight teeth (for example, the first meshing portion 42 and the second meshing portion 44 of the connector 4) are meshed with drum teeth (for example, the gearbox meshing portion of the gearbox interface 1 and the plunger pump device meshing portion of the plunger pump device interface 3). When the two tooth surfaces of the straight teeth and the drum teeth have a slight deflection angle, their contact surfaces will not change greatly, so under long-term meshing movement, the tooth surfaces are in good contact, and compared with the case of straight tooth meshing, the contact surface condition is greatly improved. Therefore, the connection system according to the present embodiment will not have extreme phenomena such as broken teeth, cracks and pitting, and only normal tooth surface wear will occur, so that the service life is greatly improved.

[0071] In addition, the size of the second meshing portion 44 of the connecting member 4 can also be designed and selected for a reduction box of a specific power. In this case, the shaft 46 can be designed in the form of a stepped shaft.

[0072] Other aspects of this embodiment are the same as those of the first embodiment.

[0073] Therefore, the connection system according to this embodiment allows different reduction gearboxes and plunger pump devices to be connected in the same platform by directly replacing the corresponding connecting parts. Thus, this design provides convenience for the connection between different devices in the platform and provides guarantee for the subsequent development of different reduction gearboxes, thereby promoting the development of platformization.

[0074] Other Modifications

[0075] The above embodiments illustrate the case where the external teeth in the first meshing pair and the second meshing pair are both designed as drum-shaped teeth and the internal teeth are both designed as straight teeth, but the present invention is not limited to these cases.

[0076] According to a modified example as a variation, for example, in the first meshing pair and the second meshing pair, the external teeth may both be designed as spur teeth, and the internal teeth may both be designed as crown teeth.

[0077] Alternatively, according to an improved example as a variation, for example, in a first meshing pair, the outer teeth may be designed as straight teeth and the inner teeth may be designed as drum teeth, while in a second meshing pair, the outer teeth may be designed as drum teeth and the inner teeth may be designed as straight teeth.

[0078] Alternatively, according to an improved example as a variation, for example, in a first meshing pair, the outer teeth may be designed as drum teeth and the inner teeth may be designed as straight teeth, while in a second meshing pair, the outer teeth may be designed as straight teeth and the inner teeth may be designed as drum teeth.

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

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

[0081] Therefore, the connection system according to these improved examples adopts a connection method in which straight teeth and drum teeth are meshed, and thus the same technical effects as those of the above-mentioned embodiments can be obtained.

[0082] Limiting mechanism

[0083] During operation of the piston pump equipment, Figures 2 to 5 In the example shown, the connector 2 has excessive axial play between the gearbox interface 1 and the plunger pump device interface 3. When the connector is biased to one side, the actual contact area of ​​the drum gear becomes narrower, which in turn affects the contact strength, so the axial limit problem needs to be considered.

[0084] Fig.14 Shows Figures 2 to 5 The connecting member 2 is shown in a cross-sectional view in a state where it is engaged with the reduction gearbox interface 1 and the piston pump device interface 3 .

[0085] like Fig.14As shown, a limiting mechanism is fixed on the plunger pump device interface 3. The limiting mechanism is, for example, in the form of an L-shaped plate 5. For example, one leg 51 of the two legs of the L-shaped plate 5 is fixed on the plunger pump device interface 3, for example, by bolt connection.

[0086] In addition, a recess 27 is provided on the outer circumference of the shaft 26 between the two engagement portions 22 and 24 of the connecting member 2. The other leg 52 of the two legs of the L-shaped plate 5, which is perpendicular to the leg 51, is received in the recess 27 in a non-fixed manner.

[0087] The axial dimension of the leg 52 of the L-shaped plate 5 and the axial dimension of the recess 27 are set so that the leg 52 can be displaced in the recess 27 in the axial direction by a certain axial displacement amount. Figure 5 In the horizontal direction of the L-shaped plate 5. For example, the axial dimension of the recess 27 can be slightly larger than the axial dimension of the leg 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. In other words, 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 in the recess 27 always falls within the allowable axial displacement.

[0088] exist Fig.14 In the example shown, the L-shaped plate 5 is fixed on 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 on the reduction box interface 1 or fixed on both the reduction box interface 1 and the plunger pump device interface 3.

[0089] By providing a limiting mechanism, it is possible to prevent the connecting member 2 from excessive axial movement between the reduction box interface 1 and the plunger pump device interface 3 .

[0090] Although the L-shaped plate-shaped limiting mechanism is used as an example to illustrate the case where the connecting member 2 is provided, the L-shaped plate-shaped limiting mechanism can also be appropriately applied to the connecting members in other examples or modified examples. Since the operating mechanism is exactly the same, it will not be described in detail here.

[0091] The above describes an example of limiting the axial displacement of the connecting member by providing a limiting mechanism in the middle of the connecting member, but the axial displacement of the connecting member may also be limited by providing limiting mechanisms on both sides of the connecting member.

[0092] Fig.15 Shows Figures 6 to 10 The connecting member 2' shown is a cross-sectional view of a state in which the connecting member 2' is engaged with a reduction gearbox interface (not shown) and a plunger pump device interface 3.

[0093] like Fig.15As shown, one or more stepped members 61 are fixed at the right end of the connecting member 2' (specifically, the end on the interface side of the plunger pump device) to limit the leftward displacement of the connecting member 2' in the axial direction. Figure 6 Two stepped members 61 can be seen. For example, the stepped members 61 can be screwed into threaded holes provided on the circumference of the end side of the connecting member 2' by bolts. Of course, the fixing of the stepped members 61 on the connecting member 2' is not limited to screws, and can also be detachably connected or fixed by other means.

[0094] Fig.16 Shows Fig.15 A partial enlarged view of part A in FIG.

[0095] In addition, one or more auxiliary stoppers 62 are provided at the left end of the connecting member 2' (specifically, the end of the connecting member 2' on the gearbox interface side) to limit the rightward displacement of the connecting member 2' in the axial direction. Specifically, a step 28 is provided at the transition portion between the shaft 26' of the connecting member 2' and the end on the gearbox interface side, so that the step 28 forms a recess together with the plunger pump device interface 3 to accommodate the auxiliary stoppers 62. Figure 6 In the embodiment, the left end of the auxiliary limiting member 62 abuts against the step 28, and the right end abuts against the plunger pump device interface 3, thereby limiting the rightward displacement of the connecting member 2' along the axial direction.

[0096] Through the cooperation of the stepped member 61 and the auxiliary limiting member 62 , a limiting effect similar to that of the limiting mechanism of the fourth embodiment can be achieved.

[0097] Fig.17 A separate stepped member 61 is shown. As shown, the stepped member 61 includes a body 611 and a step portion 612 having a radial dimension smaller than the body 611. The axial thickness of the step portion 612 can be set to 2 to 8 mm, for example, so as to achieve an allowable axial displacement of the connector 2' of 2 to 8 mm.

[0098] By providing a limiting mechanism including a stepped member 61 and an auxiliary limiting member 62 , it is possible to prevent the connecting member 2 ′ from excessive axial movement between the reduction box interface 1 and the plunger pump device interface 3 .

[0099] Although the connection member 2' is used as an example to illustrate the case of setting the limiting structure including the stepped member 61 and the auxiliary limiting member 62, the limiting mechanism including the stepped member 61 and the auxiliary limiting member 62 can also be appropriately applied to the connection members of other examples and modified examples. Since the operating mechanism is exactly the same, it will not be described in detail here.

[0100] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A connection system for a plunger pump device, characterized in that: include: Connector (2; 2'; 4), comprising 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)； A reduction gearbox interface (1), comprising a third meshing portion (12); as well as The plunger pump device interface (3) comprises a fourth meshing portion (32), wherein 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 inner teeth and the outer teeth of the first meshing pair, or respectively the outer teeth and the inner teeth of the first meshing pair, The second meshing portion (24; 24'; 44) and the fourth meshing portion (32) are respectively the inner teeth and the outer teeth of the second meshing pair, or respectively the outer teeth and the inner teeth of the second meshing pair, The outer teeth or the inner teeth of the first meshing pair are designed as crown-shaped teeth, and / or the outer teeth or the inner teeth of the second meshing pair are designed as crown-shaped teeth, and The other external teeth and the internal teeth of the first toothing pair and the second toothing pair are designed as spur teeth.

2. The connection system according to claim 1, characterized in that The size of the second meshing portion (24; 24'; 44) is designed for a reduction gearbox of a specific power.

3. The connection system according to claim 1, characterized in that The shaft (26; 26'; 46) is designed in the form of a straight shaft or a stepped shaft.

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

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

6. The connection system according to claim 5, characterized in that The limiting mechanism (5) is an L-shaped plate and comprises a first leg (51) and a second leg (52) perpendicular to the first leg (51). The shaft (26; 26'; 46) is provided with a recess (27) on its outer circumference, and The first leg (51) is fixed to one or both of the plunger pump device interface (3) and the reduction box interface (1), and The second leg (52) is received in the recess (27) to limit the connection member (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 the axial dimension of the second leg (52) so as to provide an allowable axial displacement of the connecting member (2; 2'; 4).

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

9. The connection system according to claim 8, characterized in that The stepped member (61) comprises a main body (611) and a step portion (612) having a radial dimension smaller than that of the main body (611). The step portion (612) is designed to have a specific axial thickness to provide an allowable axial displacement of the connecting member (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 device interface (3) is a crankcase interface arranged on the crankcase of the plunger pump device.

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