Plunger pump

Abstract

The utility model provides a plunger pump, which comprises a shell, a plunger piston, a plunger piston, a plunger piston, a plunger piston, a plunger piston, a plunger piston, a plunger piston and a plunger piston, and is characterized in that the shell is provided with a crosshead cavity and a power cavity, the connecting rod comprises a rod body and a splicing matching part which are connected with each other, the splicing matching part is provided with a first opening groove, the splicing part is provided with a second opening groove, and the connecting rod has a mounting state and a splicing state; when the connecting rod is in a mounting state, the connecting rod enters the power cavity through the crosshead cavity; when the connecting rod is in a splicing state, the splicing matching part and the splicing piece are spliced in the power cavity, so that a mounting hole matched with the power output terminal is defined by the first opening groove and the second opening groove; the connecting line located at the two ends of the opening of the first opening groove is inclined to the extending direction of the rod body. According to the technical scheme provided by the utility model, the problem that the connecting rod with a splicing matching part cannot enter the power cavity through the crosshead cavity in the prior art, so that the connecting rod is inconvenient to mount and connect can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of plunger devices, in particular to a plunger pump. Background Art

[0002] In the prior art, when the plunger pump is installed with the connecting rod and the power output terminal, a mounting portion for connecting and installing with the cross head is provided at one end of the connecting rod, and a splicing matching portion with a semi-enclosed structure is provided at the other end of the connecting rod. When installing, the splicing matching portion and the splicing piece need to be inserted into the power cavity, and the splicing matching portion and the splicing piece are spliced ​​through the rear viewing port to form a mounting hole for installing the power output terminal.

[0003] However, the size of the crosshead cavity in the prior art is generally small, and the size of the splicing matching part is large, which will make it impossible for the splicing matching part to smoothly enter the power cavity through the crosshead cavity. During installation, the connecting rod can only be installed into the power cavity from the rear viewing port, and the mounting part is extended into the crosshead cavity, and the crosshead is directly inserted into the crosshead cavity through the connecting port connected to the crosshead cavity, and then the mounting part is connected to the crosshead in the small space of the crosshead cavity, which makes the installation of the crosshead and the connecting rod extremely inconvenient. Utility Model Content

[0004] The main purpose of the utility model is to provide a plunger pump to solve the problem in the related art that a connecting rod with a spliced ​​matching portion cannot directly enter a power chamber through a crosshead chamber, resulting in inconvenience in installing and connecting the connecting rod.

[0005] In order to achieve the above object, the utility model provides a plunger pump, comprising:

[0006] The housing has a crosshead cavity and a power cavity which are interconnected, and a power output terminal is arranged in the power cavity;

[0007] A connecting rod and a splicing piece, wherein the connecting rod comprises a rod body and a splicing fitting portion connected to each other, the splicing fitting portion has a first opening groove, the splicing piece has a second opening groove, and the connecting rod has an installation state and a splicing state; when the connecting rod is in the installation state, the connecting rod enters the power cavity through the crosshead cavity; when the connecting rod is in the splicing state, the splicing fitting portion and the splicing piece are spliced ​​in the power cavity, so that the first opening groove and the second opening groove enclose a mounting hole adapted to the power output terminal;

[0008] Wherein, a line connecting two ends of the opening of the first opening slot is arranged obliquely to the extending direction of the rod body.

[0009] Furthermore, the angle between the connecting line at the two ends of the first opening groove and the extending direction of the rod body is α, and 30°≤α≤60°.

[0010] Furthermore, an observation port connected to the power chamber is provided on the housing, and the observation port is located on a side of the power chamber away from the crosshead chamber; the plunger pump also includes:

[0011] A connecting piece, the connecting piece passes through the splicing piece and is connected to the splicing matching portion, or the connecting piece passes through the splicing matching portion and is connected to the splicing piece;

[0012] Wherein, the operating end of the connecting piece is arranged opposite to the observation port.

[0013] Further, the splicing matching part includes a first splicing body and a first connecting part connected to each other, the first splicing body is provided with a first opening groove, and the first connecting part is protruded from the outer wall of the first splicing body; the splicing piece includes a second splicing body and a second connecting part connected to each other, the second splicing body has a second opening groove, and the second connecting part is protruded from the outer wall of the second splicing body;

[0014] The first splicing body is spliced ​​with the second splicing body, and the first connecting part is spliced ​​with the second connecting part; the connecting piece passes through the first connecting part and is connected with the second connecting part, or the connecting piece passes through the second connecting part and is connected with the first connecting part.

[0015] Furthermore, a first positioning portion is provided on an end surface of the first connection portion close to the second connection portion, and a second positioning portion is provided on an end surface of the second connection portion close to the first connection portion and arranged opposite to the first positioning portion, and the first positioning portion and the second positioning portion are positioned and matched;

[0016] Wherein, the first positioning portion and the second positioning portion are both spaced apart from the connecting member.

[0017] Further, there are two first connecting parts, and the two first connecting parts are respectively located at two ends of the first opening groove; there are two second connecting parts, and the two second connecting parts are respectively located at two ends of the second opening groove; there are two first positioning parts, and the two first positioning parts are respectively arranged on the two first connecting parts; there are two second positioning parts, and the two second positioning parts are respectively arranged on the two second connecting parts, and the two second positioning parts are positioned and arranged in a one-to-one correspondence with the two first positioning parts;

[0018] The first positioning portion on one first connecting portion is staggered with the first positioning portion on another first connecting portion.

[0019] Furthermore, the splicing piece is provided with an installation through hole, the splicing matching part is provided with a positioning hole arranged opposite to the installation through hole, the installation through hole includes a fixing hole section and a top screw hole section connected to each other, the top screw hole section is located on a side of the fixing hole section away from the splicing matching part, and the top screw hole section is provided with an internal thread for threaded cooperation with the disassembly top screw; the plunger pump also includes a positioning member, and the positioning member has a positioning state and a disassembly state;

[0020] Among them, when the positioning piece is in a positioning state, a part of the positioning piece is used to be clamped in the fixing hole segment, and the other part of the positioning piece extends out of the fixing hole segment and is used to be positioned and matched with the positioning hole; when the positioning piece is in a disassembled state, the disassembly and assembly screw is threadedly connected with the internal thread to push the positioning piece in the fixing hole segment out by the disassembly and assembly screw.

[0021] Furthermore, the plunger pump further comprises a first bearing bush and a second bearing bush, the first bearing bush is installed in the first opening groove, and the second bearing bush is installed in the second opening groove;

[0022] Wherein, a first positioning protrusion is provided on the first bearing shell, and a first positioning groove matched with the first positioning protrusion is provided on one side of the splicing matching portion close to the first opening groove; and / or,

[0023] A second positioning protrusion is arranged on the second bearing shell, and a second positioning groove matched with the second positioning protrusion is arranged on one side of the splicing piece close to the second opening groove.

[0024] Furthermore, a first oil groove is provided on a side of the first bearing away from the splicing mating portion, and a second oil groove is provided on a side of the second bearing away from the splicing piece, and the first oil groove and the second oil groove are connected to form an annular oil channel surrounding the power output terminal;

[0025] Among them, an oil channel through hole is provided on the splicing matching part, and the oil channel through hole is connected with the first oil groove.

[0026] Further, the rod body includes a main body and a sleeve part, the sleeve part has a sleeve hole, the sleeve part is provided with a first oil through hole and a second oil through hole at intervals, the first oil through hole and the second oil through hole are both provided through the side wall of the sleeve part, and the second oil through hole is located at one end of the sleeve part close to the main body; an oil passage is provided on the main body, and the two ends of the oil passage are respectively connected to the second oil through hole and the oil channel through hole, so that the oil entering the sleeve hole through the first oil through hole flows into the second oil through hole; and / or,

[0027] The main body is provided with a weight-reducing groove, and the weight-reducing groove is arranged at intervals from the oil passage through hole.

[0028] By applying the technical solution of the utility model, since the connecting line of the two ends of the opening of the first opening groove is tilted along the extension direction of the rod body, the size of the splicing fitting part in the direction perpendicular to the extension direction of the rod body is smaller and smaller than the internal size of the crosshead cavity, so that the splicing fitting part can smoothly pass through the crosshead cavity into the power cavity. In this way, the connecting rod and the crosshead can be pre-installed and connected, and then the connecting rod can be installed from the crosshead cavity to the power cavity, and the splicing fitting part and the splicing piece can be smoothly spliced ​​in the power cavity. The above-mentioned installation process does not require the installation of the crosshead and the connecting rod in the crosshead cavity with a smaller space, which facilitates the connection between the crosshead and the connecting rod. Therefore, the technical solution provided by the utility model can solve the problem in the related art that the connecting rod with the splicing fitting part cannot directly enter the power cavity through the crosshead cavity, which makes it inconvenient to install and connect the connecting rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0030] Figure 1 A schematic structural diagram of a plunger pump provided according to an embodiment of the utility model is shown;

[0031] Figure 2 A schematic structural diagram of a plunger pump provided according to an embodiment of the utility model before the connecting rod and the splicing piece are installed is shown;

[0032] Figure 3 A schematic structural diagram of a connecting rod of a plunger pump provided in an embodiment of the utility model at a viewing angle is shown;

[0033] Figure 4 A schematic structural diagram of a connecting rod of a plunger pump provided in an embodiment of the utility model from another perspective is shown;

[0034] Figure 5 A schematic structural diagram of a plunger pump assembly provided according to an embodiment of the utility model is shown in one viewing angle;

[0035] Figure 6 A partial structural schematic diagram of a mounting through hole of a plunger pump provided according to an embodiment of the utility model is shown;

[0036] Figure 7 An exploded view of a connecting rod and a splicing piece of a plunger pump provided according to an embodiment of the utility model is shown;

[0037] Figure 8The schematic diagram shows the structure of the first bearing bush and the second bearing bush of the plunger pump provided in the embodiment of the utility model when they are connected.

[0038] The above drawings include the following reference numerals:

[0039] 10. Shell; 11. Crosshead cavity; 12. Power cavity; 13. Observation port;

[0040] 20. Power output terminal;

[0041] 30. Connecting rod; 31. Rod body; 311. Main body; 3111. Weight-reducing groove; 312. Sleeve portion; 3121. Sleeve hole; 3122. First oil passage hole; 3123. Second oil passage hole; 32. Jointing portion; 321. First joint body; 3211. First opening groove; 3212. Positioning hole; 3213. First positioning groove; 3214. Oil passage hole; 3215. Second connecting hole; 322. First connecting portion;

[0042] 40, splicing piece; 41, second splicing body; 411, second opening groove; 412, second positioning groove; 42, second connecting portion; 43, mounting through hole; 431, fixing hole section; 432, top screw hole section; 433, middle hole section; 44, first connecting hole;

[0043] 50. Connecting piece; 51. Operating end;

[0044] 60. Positioning parts;

[0045] 71, first bearing shell; 711, first positioning protrusion; 712, first oil groove; 713, oil channel hole; 72, second bearing shell; 721, second positioning protrusion; 722, second oil groove;

[0046] 80. Crosshead. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0048] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0049] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0050] like Figures 1 to 8 As shown, an embodiment of the utility model provides a plunger pump, which includes a housing 10, a connecting rod 30 and a splicing piece 40. The housing 10 has a crosshead cavity 11 and a power cavity 12 that are interconnected, and a power output terminal 20 is provided in the power cavity 12. The connecting rod 30 includes a rod body 31 and a splicing matching portion 32 that are connected to each other, the splicing matching portion 32 has a first opening groove 3211, and the splicing piece 40 has a second opening groove 411. The connecting rod 30 has an installation state and a splicing state. When the connecting rod 30 is in the installation state, the connecting rod 30 enters the power cavity 12 through the crosshead cavity 11; when the connecting rod 30 is in the splicing state, the splicing matching portion 32 and the splicing piece 40 are spliced ​​in the power cavity 12, so that the first opening groove 3211 and the second opening groove 411 surround a mounting hole that is compatible with the power output terminal 20. The connecting line at both ends of the opening of the first opening groove 3211 is inclined to the extension direction of the rod body 31.

[0051] With the plunger pump provided in this embodiment, since the connecting line of the two ends of the opening of the first opening groove 3211 is inclined along the extension direction of the rod body 31, the size of the splicing fitting part 32 in the direction perpendicular to the extension direction of the rod body 31 is small and smaller than the internal size of the crosshead cavity 11, so that the splicing fitting part 32 can smoothly pass through the crosshead cavity 11 into the power cavity 12, so that the splicing fitting part 32 and the splicing piece 40 are arranged around the periphery of the power output terminal 20 in the power cavity 12 and spliced. In this way, the connecting rod 30 and the crosshead 80 can be pre-installed and connected outside the crosshead cavity 11 and the power cavity 12, and then the connecting rod 30 is installed from the crosshead cavity 11 to the power cavity 12, and the splicing fitting part 32 and the splicing piece 40 can be smoothly spliced ​​in the power cavity 12. The above installation process does not require the crosshead 80 and the connecting rod 30 to be installed in the crosshead cavity 11 with a small space, which facilitates the connection between the crosshead 80 and the connecting rod 30. Therefore, the technical solution provided by the utility model can solve the problem in the related art that the connecting rod with the splicing matching part cannot directly enter the power cavity through the crosshead cavity, which makes it inconvenient to install and connect the connecting rod.

[0052] Specifically, Figure 2 As shown, the length of the splicing fitting part 32 in the direction perpendicular to the extension direction of the rod body 31 is h1, and the length of the crosshead cavity 11 in the direction perpendicular to the extension direction of the crosshead cavity 11 is h2. By tilting the splicing fitting part 32, h1≤h2, so that the connecting rod 30 can enter the power cavity 12 from the crosshead cavity 11.

[0053] In this embodiment, the angle between the connecting line at both ends of the first opening slot 3211 and the extension direction of the rod body 31 is α, 30°≤α≤60°. Within this angle range, it is possible to ensure that the splicing mating portion 32 can enter the power cavity 12 from the crosshead cavity 11.

[0054] In this embodiment, an observation port 13 connected to the power chamber 12 is provided on the housing 10, and the observation port 13 is located on the side of the power chamber 12 away from the crosshead chamber 11. The plunger pump also includes a connecting piece 50, and the connecting piece 50 passes through the splicing piece 40 to connect with the splicing fitting part 32, or the connecting piece 50 passes through the splicing fitting part 32 to connect with the splicing piece 40. Among them, the operating end 51 of the connecting piece 50 is arranged opposite to the observation port 13. In this way, the operating end 51 of the connecting piece 50 is arranged opposite to the observation port 13, and the connecting piece 50 can be directly operated through the observation port 13, so that it is more convenient to apply force to the operating end 51, and it is convenient to splice and install the splicing fitting part 32 and the splicing piece 40. In addition, the above-mentioned arrangement can also ensure that the force applied to the operating end 51 can meet the use requirements, thereby ensuring the structural stability of the plunger pump.

[0055] Specifically, the connecting member 50 is a bolt, and the observation port 13 is a rear window opening. If the operating end 51 is located on the side away from the observation port 13, it is necessary to apply torque to the operating end 51 through the rear window opening, which makes it inconvenient to operate the operating end 51. Moreover, it is difficult to apply a fixed torque to the operating end 51 in this way, which may easily lead to the bolt breaking during the use of the plunger pump. Therefore, the operating end 51 of the bolt is arranged opposite to the observation port 13, which can effectively avoid this situation.

[0056] In this embodiment, the splicing matching part 32 includes a first splicing body 321 and a first connecting part 322 connected to each other, the first splicing body 321 is provided with a first opening groove 3211, and the first connecting part 322 is protruded from the outer wall of the first splicing body 321. The splicing piece 40 includes a second splicing body 41 and a second connecting part 42 connected to each other, the second splicing body 41 has a second opening groove 411, and the second connecting part 42 is protruded from the outer wall of the second splicing body 41. Among them, the first splicing body 321 is spliced ​​with the second splicing body 41, and the first connecting part 322 is spliced ​​with the second connecting part 42; the connecting piece 50 passes through the first connecting part 322 to connect with the second connecting part 42, or the connecting piece 50 passes through the second connecting part 42 to connect with the first connecting part 322. By providing the first connecting part 322 and the second connecting part 42, the openings on the first splicing body 321 and the second splicing body 41 can be reduced, thereby ensuring the structural strength of the first splicing body 321 and the second splicing body 41.

[0057] Specifically, the first splicing body 321 and the second connecting portion 42 are both semicircular arc structures. Since the first connecting portion 322 protrudes from the outer wall of the first splicing body 321 and the second connecting portion 42 protrudes from the outer wall of the second splicing body 41, the connecting piece 50 passing through the first connecting portion 322 or the second connecting portion 42 can have a larger length, so that the connection matching portion and the connecting piece 50 have a larger contact area, so as to share the load on the connecting piece 50, thereby ensuring the stability of the connection. Specifically, as Figure 1 As shown in the figure, when the opening direction of the first opening groove 3211 is tilted upward toward the observation port 13, the connecting member 50 passes through the first connecting portion 322 to connect with the second connecting portion 42; when the opening direction of the first opening groove 3211 is tilted downward toward the observation port 13, the connecting member 50 passes through the second connecting portion 42 to connect with the first connecting portion 322.

[0058] Specifically, the inner wall of the first splicing body 321 is the groove wall of the first opening groove 3211, and the outer wall of the first splicing body 321 is the wall surface of the first splicing body 321 away from the first opening groove 3211; the inner wall of the second splicing body 41 is the groove wall of the second opening groove 411, and the outer wall of the second splicing body 41 is the wall surface of the second splicing body 41 away from the second opening groove 411.

[0059] Specifically, Figures 3 to 5 As shown, when the connecting member 50 passes through the second connecting portion 42 to connect with the first connecting portion 322 , the second connecting portion 42 is provided with a first connecting hole 44 , and the first connecting portion 322 is provided with a second connecting hole 3215 , and the connecting member 50 passes through the first connecting hole 44 to connect with the second connecting hole 3215 .

[0060] In this embodiment, a first positioning portion is provided on the end surface of the first connection portion 322 close to the second connection portion 42, and a second positioning portion is provided on the end surface of the second connection portion 42 close to the first connection portion 322, which is arranged opposite to the first positioning portion, and the first positioning portion and the second positioning portion are positioned and matched. The first positioning portion and the second positioning portion are both arranged at intervals from the connecting piece 50. In this way, by providing the first positioning portion and the second positioning portion, the splicing position of the splicing matching portion 32 and the splicing piece 40 can be positioned, thereby improving the convenience of connecting the splicing matching portion 32 and the splicing piece 40.

[0061] In this embodiment, there are two first connection parts 322, and the two first connection parts 322 are respectively located at the two ends of the first opening groove 3211. There are two second connection parts 42, and the two second connection parts 42 are respectively located at the two ends of the second opening groove 411. There are two first positioning parts, and the two first positioning parts are respectively arranged on the two first connection parts 322. There are two second positioning parts, and the two second positioning parts are respectively arranged on the two second connection parts 42, and the two second positioning parts are positioned and arranged in a one-to-one correspondence with the two first positioning parts. Among them, the first positioning part on one first connection part 322 is staggered with the first positioning part on the other first connection part 322. In this way, one first positioning part is arranged on one first connection part 322, and the other first positioning part is arranged on the other first connection part 322, and the two first positioning parts on the two first connection parts 322 are staggered, so that the two second positioning parts on the corresponding two second connection parts 42 are also staggered, so that the position of the connecting member 50 can be avoided from being installed in reverse.

[0062] Specifically, “the two first positioning portions on the two first connection portions 322 are staggered” means that after the first positioning portions are respectively arranged on the two first connection portions 322 , the two first connection portions 322 are arranged asymmetrically and also not centrally symmetrically.

[0063] Specifically, during production and processing, the splicing matching part 32 and the splicing piece 40 are cast as one piece, and need to be cut to obtain the splicing matching part 32 and the splicing piece 40. Due to the limitation of cutting accuracy, if the splicing matching part 32 and the splicing piece 40 are installed upside down, it is difficult to obtain a mounting hole that matches the power output terminal 20. The two first positioning parts on the two first connecting parts 322 are staggered to effectively avoid this situation.

[0064] In this embodiment, the splicing piece 40 is provided with a mounting through hole 43, and the splicing matching part 32 is provided with a positioning hole 3212 arranged opposite to the mounting through hole 43. The mounting through hole 43 includes a fixing hole section 431 and a top screw hole section 432 connected to each other. The top screw hole section 432 is located on a side of the fixing hole section 431 away from the splicing matching part 32, and the top screw hole section 432 is provided with an internal thread for threading with a disassembly top screw. The plunger pump also includes a positioning member 60, and the positioning member 60 has a positioning state and a disassembly state. When the positioning member 60 is in the positioning state, a part of the positioning member 60 is used to be clamped in the fixing hole section 431, and another part of the positioning member 60 extends out of the fixing hole section 431 and is used for positioning with the positioning hole 3212; when the positioning member 60 is in the disassembly state, the disassembly top screw is threadedly connected with the internal thread, so as to push the positioning member 60 in the fixing hole section 431 out through the disassembly top screw.

[0065] With such an arrangement, when the positioning member 60 is in a positioning state, the positioning member 60 is clamped in the fixing hole section 431, and the other part of the positioning member 60 is connected to the positioning hole 3212, so that the positioning of the splicing fitting part 32 and the splicing member 40 can be achieved, thereby improving the convenience of positioning the splicing fitting part 32 and the splicing part; when the positioning member 60 is in a disassembled state, the disassembly and assembly screw can pass through the screw hole section 432 to more conveniently push out the positioning member 60.

[0066] Specifically, the positioning member 60 is a positioning pin, and the positioning pin can share the load borne by the connecting member 50 , thereby ensuring the stability of the splicing between the splicing matching portion 32 and the splicing member 40 .

[0067] Specifically, the mounting through hole 43 further includes a middle hole segment 433 , and the cross-sectional dimension of the fixing hole segment 431 is larger than the cross-sectional dimension of the middle hole segment 433 , so that the positioning member 60 is clamped at the connection portion between the fixing hole segment 431 and the middle hole segment 433 .

[0068] In this embodiment, the plunger pump further includes a first bearing bush 71 and a second bearing bush 72, wherein the first bearing bush 71 is installed in the first opening groove 3211, and the second bearing bush 72 is installed in the second opening groove 411. A first positioning protrusion 711 is provided on the first bearing bush 71, and a first positioning groove 3213 matching the first positioning protrusion 711 is provided on one side of the splicing fitting part 32 close to the first opening groove 3211. The first bearing bush 71 and the second bearing bush 72 can reduce the friction between the power output terminal 20 and the splicing fitting part 32 and the splicing piece 40, so as to reduce the wear of the splicing fitting part 32 and the splicing piece 40, thereby improving the service life of the splicing fitting part 32 and the splicing piece 40. The provision of the first positioning protrusion 711 and the first positioning groove 3213 can facilitate the positioning of the first bearing bush 71 and the splicing fitting part 32, thereby realizing the convenience of fixing the first bearing bush 71.

[0069] Specifically, the first positioning groove 3213 is a lip groove provided at both ends of the splicing matching portion 32 , and the second positioning groove 412 is a lip groove provided at both ends of the splicing piece 40 .

[0070] In this embodiment, the second bearing bush 72 is provided with a second positioning protrusion 721, and the side of the splicing piece 40 close to the second opening groove 411 is provided with a second positioning groove 412 adapted to the second positioning protrusion 721. By providing the second positioning protrusion 721 and the second positioning groove 412, the second bearing bush 72 and the splicing piece 40 can be positioned, thereby achieving the convenience of fixing the second bearing bush 72.

[0071] In this embodiment, a first oil groove 712 is provided on a side of the first bearing bush 71 away from the splicing fitting portion 32, and a second oil groove 722 is provided on a side of the second bearing bush 72 away from the splicing piece 40. The first oil groove 712 and the second oil groove 722 are connected to form an annular oil passage surrounding the power output terminal 20. An oil passage through hole 3214 is provided on the splicing fitting portion 32, and the oil passage through hole 3214 is connected to the first oil groove 712. In this way, oil can be supplied to the annular oil passage formed by the communication between the first oil groove 712 and the second oil groove 722 through the oil passage through hole 3214 to lubricate the contact surface between the first bearing bush 71 and the second bearing bush 72 and the power output terminal 20, thereby effectively reducing the friction between the power output terminal 20 and the first bearing bush 71 and the second bearing bush 72, and improving the service life of the first bearing bush 71 and the second bearing bush 72.

[0072] Specifically, an oil passage hole 713 is provided on the first bearing shell 71 , and the oil passage hole 713 is communicated with the oil passage through hole 3214 .

[0073] Specifically, two first positioning grooves 3213 are provided at each end of the splicing mating part 32, two first positioning protrusions 711 are provided at each end of the first bearing shell 71, a second positioning groove 412 is provided at each end of the splicing part 40, and a second positioning protrusion 721 is provided at each end of the second bearing shell 72 to prevent the first bearing shell 71 and the second bearing shell 72 from being installed misaligned, thereby ensuring that the oil channel hole 713 can be connected to the oil channel through hole 3214.

[0074] In the present embodiment, the rod body 31 includes a main body 311 and a sleeve portion 312, the sleeve portion 312 has a sleeve hole 3121, and the sleeve portion 312 is provided with a first oil through hole 3122 and a second oil through hole 3123 at intervals, the first oil through hole 3122 and the second oil through hole 3123 are both provided through the side wall of the sleeve portion 312, and the second oil through hole 3123 is located at one end of the sleeve portion 312 close to the main body 311; an oil passage is provided on the main body 311, and the two ends of the oil passage are respectively connected to the second oil through hole 3123 and the oil channel through hole 3214, so that the oil entering the sleeve hole 3121 through the first oil through hole 3122 flows into the second oil through hole 3123. In this way, oil can be supplied to the second oil through hole 3123 through the first oil through hole 3122, and oil can be supplied to the oil passage through hole 3214 through the second oil through hole 3123 and the oil passage, thereby realizing oil supply to the annular oil passage.

[0075] Specifically, the sleeve portion 312 is used to connect with the crosshead 80, and the crosshead 80 is connected with the first oil passage hole 3122 to supply oil thereto.

[0076] In this embodiment, the main body 311 is provided with a weight-reducing groove 3111, and the weight-reducing groove 3111 is arranged at intervals from the oil passage through hole 3214. In this way, the overall weight of the plunger pump can be reduced, the energy utilization efficiency of the plunger pump can be improved, and the energy loss of the plunger pump can be effectively reduced.

[0077] From the above description, it can be seen that the above-mentioned embodiments of the utility model achieve the following technical effects: when the crosshead cavity 11 is small, the size of the splicing fitting part 32 in the direction perpendicular to the extension direction of the rod body 31 is small, and the connecting rod 30 can pass through the crosshead cavity 11 into the power cavity 12, thereby ensuring the installation convenience between the connecting rod 30 and the crosshead 80.

[0078] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0079] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0080] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0081] 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 plunger pump, characterized in that: include: The housing (10) comprises a crosshead cavity (11) and a power cavity (12) which are interconnected, wherein a power output terminal (20) is provided in the power cavity (12); A connecting rod (30) and a splicing piece (40), wherein the connecting rod (30) comprises a rod body (31) and a splicing fitting portion (32) connected to each other, the splicing fitting portion (32) having a first opening groove (3211), and the splicing piece (40) having a second opening groove (411), and the connecting rod (30) has an installation state and a splicing state; when the connecting rod (30) is in the installation state, the connecting rod (30) enters the power cavity (12) through the crosshead cavity (11); when the connecting rod (30) is in the splicing state, the splicing fitting portion (32) and the splicing piece (40) are spliced ​​in the power cavity (12), so that the first opening groove (3211) and the second opening groove (411) surround a mounting hole adapted to the power output terminal (20); Wherein, a line connecting two ends of the opening of the first opening slot (3211) is arranged obliquely to the extension direction of the rod body (31).

2. The plunger pump according to claim 1, characterized in that: The angle between the line connecting the two ends of the first opening groove (3211) and the extension direction of the rod body (31) is α, and 30°≤α≤60°.

3. The plunger pump according to claim 1, characterized in that: The housing (10) is provided with an observation port (13) communicating with the power chamber (12), and the observation port (13) is located on a side of the power chamber (12) away from the crosshead chamber (11); the plunger pump further comprises: A connecting piece (50), wherein the connecting piece (50) passes through the splicing piece (40) and is connected to the splicing fitting portion (32), or the connecting piece (50) passes through the splicing fitting portion (32) and is connected to the splicing piece (40); Wherein, the operating end (51) of the connecting member (50) is arranged opposite to the observation port (13).

4. The plunger pump according to claim 3, characterized in that: The splicing matching part (32) comprises a first splicing body (321) and a first connecting part (322) connected to each other, the first splicing body (321) is provided with the first opening groove (3211), and the first connecting part (322) is arranged protruding from the outer wall of the first splicing body (321); the splicing piece (40) comprises a second splicing body (41) and a second connecting part (42) connected to each other, the second splicing body (41) has the second opening groove (411), and the second connecting part (42) is arranged protruding from the outer wall of the second splicing body (41); The first splicing body (321) is spliced ​​with the second splicing body (41), and the first connecting part (322) is spliced ​​with the second connecting part (42); the connecting piece (50) passes through the first connecting part (322) to be connected with the second connecting part (42), or the connecting piece (50) passes through the second connecting part (42) to be connected with the first connecting part (322).

5. The plunger pump according to claim 4, characterized in that: A first positioning portion is provided on an end surface of the first connecting portion (322) close to the second connecting portion (42), and a second positioning portion is provided on an end surface of the second connecting portion (42) close to the first connecting portion (322) and is arranged opposite to the first positioning portion, and the first positioning portion and the second positioning portion are positioned and matched; Wherein, the first positioning portion and the second positioning portion are both arranged at a distance from the connecting member (50).

6. The plunger pump according to claim 5, characterized in that There are two first connecting parts (322), and the two first connecting parts (322) are respectively located at two ends of the first opening groove (3211); there are two second connecting parts (42), and the two second connecting parts (42) are respectively located at two ends of the second opening groove (411); there are two first positioning parts, and the two first positioning parts are respectively arranged on the two first connecting parts (322); there are two second positioning parts, and the two second positioning parts are respectively arranged on the two second connecting parts (42), and the two second positioning parts are positioned and arranged in a one-to-one correspondence with the two first positioning parts; Wherein, the first positioning portion on one of the first connecting portions (322) is arranged in a staggered manner with the first positioning portion on another of the first connecting portions (322).

7. The plunger pump according to claim 1, characterized in that: The splicing piece (40) is provided with a mounting through hole (43), the splicing fitting portion (32) is provided with a positioning hole (3212) arranged opposite to the mounting through hole (43), the mounting through hole (43) comprises a fixing hole section (431) and a top screw hole section (432) connected to each other, the top screw hole section (432) is located on a side of the fixing hole section (431) away from the splicing fitting portion (32), and the top screw hole section (432) is provided with an internal thread for threading with a disassembly top screw; the plunger pump also includes a positioning member (60), and the positioning member (60) has a positioning state and a disassembled state; Wherein, when the positioning member (60) is in the positioning state, a part of the positioning member (60) is used to be clamped in the fixing hole section (431), and another part of the positioning member (60) extends out of the fixing hole section (431) and is used to be positioned and matched with the positioning hole (3212); when the positioning member (60) is in the disassembly state, the disassembly and assembly screw is connected to the internal thread through a thread, so that the positioning member (60) in the fixing hole section (431) can be pushed out by the disassembly and assembly screw.

8. The plunger pump according to claim 1, characterized in that The plunger pump further comprises a first bearing bush (71) and a second bearing bush (72), wherein the first bearing bush (71) is installed in the first opening groove (3211), and the second bearing bush (72) is installed in the second opening groove (411); Wherein, a first positioning protrusion (711) is provided on the first bearing shell (71), and a first positioning groove (3213) adapted to the first positioning protrusion (711) is provided on one side of the splicing matching portion (32) close to the first opening groove (3211); and / or, The second bearing shell (72) is provided with a second positioning protrusion (721), and a second positioning groove (412) matched with the second positioning protrusion (721) is provided on one side of the splicing piece (40) close to the second opening groove (411).

9. The plunger pump according to claim 8, characterized in that A first oil groove (712) is provided on a side of the first bearing shell (71) away from the splicing fitting portion (32), and a second oil groove (722) is provided on a side of the second bearing shell (72) away from the splicing piece (40), wherein the first oil groove (712) and the second oil groove (722) are connected to form an annular oil passage surrounding the power output terminal (20); Wherein, an oil passage through hole (3214) is provided on the splicing fitting portion (32), and the oil passage through hole (3214) is connected to the first oil groove (712).

10. The plunger pump according to claim 9, characterized in that The rod body (31) comprises a main body (311) and a sleeve portion (312); the sleeve portion (312) has a sleeve hole (3121); a first oil passage hole (3122) and a second oil passage hole (3123) are arranged on the sleeve portion (312); the first oil passage hole (3122) and the second oil passage hole (3123) are both arranged through the side wall of the sleeve portion (312); and the second oil passage hole (3123) is arranged to pass through the side wall of the sleeve portion (312). 123) is located at one end of the sleeve portion (312) close to the main body portion (311); an oil passage is provided on the main body portion (311), and both ends of the oil passage are respectively connected to the second oil passage through hole (3123) and the oil passage through hole (3214), so that the oil entering the sleeve hole (3121) through the first oil passage through hole (3122) flows into the second oil passage through hole (3123); and / or, The main body (311) is provided with a weight-reducing groove (3111), and the weight-reducing groove (3111) is spaced apart from the oil passage through hole (3214).

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