Crankcase of plunger pump

Abstract

The utility model relates to the technical field of plunger pumps, in particular to a plunger pump crankcase which comprises a crankcase body, a cover plate, a crankshaft, a connecting rod, a rigid connecting ring and an elastic connecting ring, a containing cavity is formed in the upper end of the crankcase body, the cover plate is connected to the crankcase body and covers a cavity opening of the containing cavity, the crankshaft is rotationally embedded in the containing cavity, the rotating axis of the crankshaft is horizontal, and the crankshaft is provided with a mounting groove; two connecting rods are connected in any mounting groove, the other ends of the connecting rods are hinged to the plunger assemblies, the rigid connecting rings and the elastic connecting rings are arranged on the peripheries of the two connecting rods in the same mounting groove in a sleeving mode, and annular grooves are formed in the periphery of the crankshaft and used for allowing the rigid connecting rings and the elastic connecting rings to be embedded therein. The annular grooves are formed in the two sides of the mounting groove, when the connecting rod is mounted, the rigid connecting ring and the elastic connecting ring are embedded into the annular grooves, the possibility that the rigid connecting ring and the elastic connecting ring are embedded into the mounting groove and the connecting rod is prevented from being embedded is reduced, mounting and fixing of the crankshaft and the connecting rod are conveniently achieved, and the assembling efficiency of the plunger pump is improved.

Description

Technical Field

[0001] The present application relates to the technical field of plunger pumps, and in particular to a plunger pump crankcase. Background Art

[0002] A plunger pump utilizes the reciprocating motion of a plunger within a cylinder, creating a change in volume between the plunger and the pump wall, repeatedly drawing in and out liquid and increasing its pressure. Plunger pumps offer advantages such as high rated pressure, compact structure, high efficiency, and easy flow regulation. They are widely used in applications requiring high pressure, high flow, and flow control, such as hydraulic presses, construction machinery, and ships. Currently, a typical plunger pump structure features a pump head mounted on one side of the crankcase, with a connecting rod inside the crankcase connecting to the plunger in the pump head. This structure limits the flow rate of plunger pumps.

[0003] Chinese utility model patent CN214035986U discloses a double-pump-head plunger pump, comprising a crankcase, a left pump head and a right pump head being respectively provided on the left and right sides of the crankcase, a crankshaft being longitudinally provided in the crankcase, a connecting rod mounting position being provided on the crankshaft, a left connecting rod and a right connecting rod being respectively provided on the left and right sides of the crankshaft, the left end of the left connecting rod being connected to a left plunger slidably arranged in a working chamber of the left pump head, the right end of the right connecting rod being connected to a right plunger slidably arranged in the working chamber of the right pump head, the right end of the left connecting rod being fixedly connected to the left end of the right connecting rod by a connecting ring sleeved on the left connecting rod and the right connecting rod, the connecting ring comprising a rigid connecting ring and an elastic connecting ring located between the rigid connecting ring and the side wall of the connecting rod mounting position.

[0004] The above-mentioned crankcase is used in conjunction with two pump heads to form a double-head plunger pump. Although the flow rate of the plunger pump is greatly increased, when the left and right connecting rods are embedded in the connecting rod mounting position, the two sets of rigid connecting rings and elastic connecting rings need to be slid to both sides respectively to reserve space for the connecting rod to be embedded. In order to ensure the stability of the connection between the connecting rod and the crankshaft, the sum of the distances between the side walls on both sides of the connecting rod and the side walls on both sides of the connecting rod mounting position is less than the sum of the thicknesses of the rigid connecting ring and the elastic connecting ring. When the connecting rod is embedded in the connecting rod mounting position, it is easily obstructed by the connecting ring. In order to ensure the smooth assembly, the elastic connecting ring currently adopts an open retaining ring design. After the connecting rod is assembled, the elastic connecting ring is sleeved in the connecting rod mounting position to reduce the influence of the connecting ring during the connecting rod assembly process. However, this structural assembly method is relatively complicated, which affects the assembly efficiency of the plunger pump. Utility Model Content

[0005] In order to facilitate the installation and fixation of the crankshaft and the connecting rod and improve the assembly efficiency of the plunger pump, the present application provides a plunger pump crankcase.

[0006] The present application provides a plunger pump crankcase adopting the following technical solution:

[0007] A plunger pump crankcase comprises a case body, a cover plate, a crankshaft, a connecting rod, a rigid connecting ring and an elastic connecting ring. A accommodating cavity is provided at the upper end of the case body. The cover plate is connected to the case body and covers the cavity opening of the accommodating cavity. The crankshaft rotates and is embedded in the accommodating cavity. The rotation axis of the crankshaft is horizontal. The crankshaft is provided with a mounting groove. Two connecting rods are connected in any of the mounting grooves. The other end of the connecting rod is hinged to the plunger assembly. The rigid connecting ring and the elastic connecting ring are sleeved on the outer periphery of the two connecting rods in the same mounting groove. An annular groove is provided on the outer periphery of the crankshaft. The annular groove is used for embedding the rigid connecting ring and the elastic connecting ring.

[0008] By adopting the above technical solution, annular grooves are provided on both sides of the mounting groove. When installing the connecting rod, the rigid connecting ring and the elastic connecting ring are embedded in the annular grooves, reducing the possibility of the rigid connecting ring and the elastic connecting ring being embedded in the mounting groove and hindering the embedding of the connecting rod, thereby facilitating the installation and fixation of the crankshaft and the connecting rod and improving the assembly efficiency of the plunger pump.

[0009] Preferably, there are several mounting grooves, and the mounting grooves are spaced apart along the crankshaft rotation axis. The axis of any mounting groove is parallel to and does not overlap with the crankshaft rotation axis. The distance from the axis of any mounting groove to the crankshaft rotation axis is equal, and the axes of the mounting grooves are evenly distributed around the crankshaft rotation axis.

[0010] By adopting the above technical solution, several installation grooves are distributed at intervals along the crankshaft rotation axis, and the axes of several installation grooves are evenly distributed around the crankshaft rotation axis, so that each part of the crankshaft is subjected to uniform force, reducing the possibility of crankshaft damage due to stress concentration and increasing the service life of the crankshaft.

[0011] Preferably, the connecting rod is provided with an arcuate surface at one end close to the crankshaft, and the connecting rod is rotatably embedded in the mounting groove at the end close to the arcuate surface. The arcuate surface fits the bottom of the mounting groove, and the rotation axis of the connecting rod coincides with the axis of the mounting groove.

[0012] By adopting the above technical solution, an arcuate surface is provided, the arcuate surface fits with the bottom of the mounting groove, and the axis of the arcuate surface coincides with the axis of the mounting groove, which facilitates the positioning of the connecting rod and the crankshaft and improves the stability of the connection between the connecting rod and the crankshaft during operation.

[0013] Preferably, the connecting rod is connected to a convex ring along one side of the connecting rod rotation axis, the convex ring axis coincides with the connecting rod rotation axis, the rigid connecting ring is sleeved on the outer circumference of the two convex rings, the inner wall of the rigid connecting ring is in contact with the outer wall of the convex ring, the outer circumference of the convex ring away from the other convex ring is coaxially provided with a step groove, the elastic connecting ring is embedded in the two step grooves, and the inner wall of the elastic connecting ring is in contact with the wall of the step groove.

[0014] By adopting the above technical solution, a convex ring is set to facilitate the rigid connecting ring to be sleeved on the outer periphery of the two convex rings, so that the two connecting rods are clamped at the bottom of the mounting groove, thereby achieving radial relative fixation of the two connecting rods and the crankshaft. A step groove is provided on the outer periphery of the convex ring, and the elastic connecting ring is embedded in the step groove, thereby further achieving relative fixation of the two connecting rods and the crankshaft.

[0015] Preferably, there are two convex rings, which are symmetrically distributed along the rotation axis of the connecting rod, and the number of the rigid connecting rings and the elastic connecting rings is the same as the number of the convex rings and corresponds one to one.

[0016] By adopting the above technical solution, convex rings are provided on both sides of the connecting rod, and the number of rigid connecting rings and elastic connecting rings is the same as the number of convex rings and corresponds one to one, thereby improving the stability of the connection between the two connecting rods and the crankshaft.

[0017] Preferably, the number of the annular grooves is the same as the number of the elastic connecting rings and corresponds one to one, and the two annular grooves are symmetrically distributed on both sides of the mounting groove along the rotation axis of the crankshaft.

[0018] By adopting the above technical solution, two ring grooves are symmetrically distributed on both sides of the installation groove, and are respectively used for the rigid connecting ring and the elastic connecting ring sleeved on both sides of the connecting rod to be embedded.

[0019] Preferably, the thickness of the elastic connecting ring is greater than the width of the step groove.

[0020] By adopting the above technical solution, the thickness of the elastic connecting ring is greater than the width of the step groove, so that the end of the elastic connecting ring away from the rigid connecting ring extends out of the step groove, and the axial fixation of the connecting rod and the crankshaft is achieved by the elastic connecting ring abutting against the wall of the mounting groove.

[0021] Preferably, it also includes a retaining spring, the number of which is the same as the number of the elastic connecting rings and corresponds one to one, the retaining spring is embedded in the mounting groove, one side surface of the retaining spring abuts against the wall of the mounting groove, and the other side surface of the retaining spring abuts against the side surface of the elastic connecting ring away from the rigid connecting ring.

[0022] By adopting the above technical solution, the number of retaining springs is the same as the number of elastic connecting rings and corresponds one to one. The retaining springs are located in the mounting grooves, and the two sides of the retaining springs respectively abut the mounting groove walls and the side surface of the elastic connecting ring away from the rigid connecting ring, thereby realizing axial fixation of the connecting rod and the crankshaft, reducing the contact area between the elastic connecting ring and the bottom of the mounting groove, reducing the possibility of wear between the elastic connecting ring and the mounting groove walls, and improving the service life of the crankshaft and the elastic connecting ring.

[0023] Preferably, first chamfers are respectively provided on the groove walls on both sides of the installation groove, and the first chamfers are located on the side of the installation groove away from the groove bottom of the installation groove. The first chamfers are used for abutment of one end of the connecting rod close to the arc surface.

[0024] By adopting the above technical solution, a first chamfer is provided on the wall of the installation groove, and the first chamfer abuts against the connecting rod, which guides the installation of the connecting rod, facilitates the connecting rod to be embedded in the installation groove, improves the installation efficiency of the connecting rod and the crankshaft, and improves the assembly efficiency of the plunger pump.

[0025] Preferably, it further comprises a lifting lug, wherein a plurality of the lifting lugs are provided, the lifting lugs are connected to a surface of a side of the cover plate away from the box body, and the plurality of the lifting lugs are distributed at intervals along the cover plate.

[0026] By adopting the above technical solution, a lifting lug is connected to the side of the cover away from the box body, and the lifting lug is convenient for external transport equipment to be clamped, thereby realizing the transport of the plunger pump.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. Ring grooves are provided on both sides of the mounting groove. When installing the connecting rod, the rigid connecting ring and the elastic connecting ring are embedded in the ring grooves, which reduces the possibility of the rigid connecting ring and the elastic connecting ring being embedded in the mounting groove and obstructing the embedding of the connecting rod, facilitates the installation and fixation of the crankshaft and the connecting rod, and improves the assembly efficiency of the plunger pump;

[0029] 2. A convex ring is provided to facilitate the rigid connecting ring to be sleeved on the outer periphery of the two convex rings, so that the two connecting rods are clamped on the bottom of the mounting groove, thereby achieving radial relative fixation of the two connecting rods and the crankshaft. A step groove is provided on the outer periphery of the convex ring, and the elastic connecting ring is embedded in the step groove, further achieving relative fixation of the two connecting rods and the crankshaft. A convex ring is provided on both sides of the connecting rod. The number of rigid connecting rings and elastic connecting rings is the same as the number of convex rings and corresponds one to one, thereby improving the stability of the connection between the two connecting rods and the crankshaft;

[0030] 3. Two ring grooves are symmetrically distributed on both sides of the installation groove, which are used to embed the rigid connecting ring and elastic connecting ring respectively installed on both sides of the connecting rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the exploded structure of the plunger pump crankcase.

[0032] Figure 2 It is a cross-sectional view of the piston pump crankcase.

[0033] Figure 3 It is a structural diagram of the crankshaft.

[0034] Figure 4 It is a cross-sectional view of the crankshaft, connecting rod, connecting ring, circlip and plunger assembly.

[0035] Figure 5 It is a structural diagram of the crankshaft, connecting rod, connecting ring, retaining ring and plunger assembly.

[0036] Figure 6 yes Figure 2Enlarged view of point A in the middle.

[0037] Figure 7 It is a structural diagram of the connecting rod.

[0038] Description of reference numerals:

[0039] 1. Crankcase body; 11. Crankcase body; 111. Accommodating chamber; 112. First fixing hole; 113. Second fixing hole; 114. First connecting hole; 115. Second connecting hole; 116. Working chamber; 12. Cover plate; 121. First connecting hole; 122. Second connecting hole; 13. Lifting lug; 131. Mounting hole; 132. Lifting hole; 14. First end cover; 141. First embedding groove; 15. Second end cover; 151. Second embedding groove; 152. Third connecting hole;

[0040] 2. Crankshaft; 21. Mounting groove; 22. Ring groove; 23. First chamfer; 24. Rotation groove;

[0041] 3. Connecting rod; 31. Arc surface; 32. Raised ring; 321. Step groove;

[0042] 4. Connecting ring; 41. Rigid connecting ring; 42. Elastic connecting ring;

[0043] 5. Circlip;

[0044] 6. Bearings;

[0045] 7. Plunger assembly. DETAILED DESCRIPTION

[0046] The present application is further described in detail below with reference to the accompanying drawings.

[0047] Reference Figure 1The embodiment of the present application discloses a plunger pump crankcase including a crankcase body 1. The crankcase body 1 includes a case body 11, a cover plate 12 and a lifting lug 13. The upper end of the case body 11 is provided with a receiving cavity 111. The cover plate 12 is connected to the case body 11 and covers the opening of the receiving cavity 111. The cover plate 12 is provided with a plurality of first connecting holes 121, and the plurality of first connecting holes 121 are distributed at intervals along the circumference of the cover plate 12. The upper end of the case body 11 is provided with first fixing holes 112, and the number of the first fixing holes 112 is the same as the number of the first connecting holes 121 and corresponds one to one. The bolt passes through the first connecting hole 121 and is threadedly connected to the first fixing hole 112. The cover plate 12 is provided with second connecting holes 122, and there are four second connecting holes 122. The four second connecting holes 122 are distributed at the four corners of the cover plate 12. The case body 11 is provided with second fixing holes 113, and the number of the second fixing holes 113 is the same as the number of the second connecting holes 122 and corresponds one to one. The lifting lugs 13 are fixedly attached to the side of the cover plate 12 facing away from the housing 11. The number of lifting lugs 13 matches the number of second connection holes 122, and they correspond one-to-one. Each lifting lug 13 is provided with mounting holes 131. Bolts pass through the mounting holes 131 and the second connection holes 122, respectively, and then thread into the second fixing holes 113. In this embodiment, the four lifting lugs 13 are divided into two groups. The two groups of lifting lugs 13 are symmetrically distributed along the length of the housing 11, and the lugs 13 in the same group are symmetrically distributed along the width of the housing 11. The lifting lugs 13 are L-shaped, and the end of the lifting lug 13 facing away from the cover plate 12 is provided with a lifting hole 132.

[0048] Reference Figure 1 and Figure 2, a plunger pump crankcase also includes a bearing 6 and a crankshaft 2. The crankshaft 2 is rotatably embedded in the accommodating chamber 111, and the rotation axis of the crankshaft 2 is parallel to the width direction of the case body 11. The crankcase body 1 also includes a first end cover 14 and a second end cover 15. A first connecting hole 114 is provided on the wall of the accommodating chamber 111 along the width direction of the case body 11. The first connecting hole 114 is connected to the outside world, and the axis of the first connecting hole 114 coincides with the rotation axis of the crankshaft 2. The first end cover 14 is coaxially embedded in the first connecting hole 114. A second connecting hole 115 is provided on the other side of the accommodating chamber 111. The second connecting hole 115 is connected to the outside world, and the axis of the second connecting hole 115 coincides with the axis of the first connecting hole 114. The second end cover 15 is coaxially embedded in the second connecting hole 115. A first embedding groove 141 is coaxially defined on the side of the first end cap 14 proximate to the accommodating chamber 111. A second embedding groove 151 is coaxially defined on the side of the second end cap 15 proximate to the accommodating chamber 111. A third connecting hole 152 is coaxially defined in the wall of the second embedding groove 151. Two bearings 6 are provided, coaxially embedded in the first embedding groove 141 and the second embedding groove 151, respectively. One end of each bearing 6 abuts the bottoms of the first and second embedding grooves 141 and 151. Rotation grooves 24 are defined on the outer circumference of the crankshaft 2 at both ends of the rotation axis. The two bearings 6 are respectively embedded in the two rotation grooves 24, with the other ends of each bearing 6 abutting the bottoms of the rotation grooves 24. The end of the crankshaft 2 away from the first end cap 14 passes through the third connecting hole 152 and extends out of the accommodating chamber 111.

[0049] Reference Figure 3 The crankshaft 2 is provided with a plurality of mounting slots 21, each of which is spaced apart along the rotational axis of the crankshaft 2. In this embodiment, three mounting slots 21 are provided, and the three mounting slots 21 are evenly distributed along the rotational axis of the crankshaft 2. The axis of each mounting slot 21 is parallel to and does not overlap with the rotational axis of the crankshaft 2. The distance between the axis of each mounting slot 21 and the rotational axis of the crankshaft 2 is equal, and the axes of the three mounting slots 21 are evenly distributed around the rotational axis of the crankshaft 2.

[0050] Reference Figure 2 and Figure 4 A plunger pump crankcase also includes connecting rods 3. Two connecting rods 3 are connected to a mounting groove 21. One end of the connecting rod 3 is rotatably embedded in the mounting groove 21, and the rotation axis of the connecting rod 3 coincides with the axis of the mounting groove 21. The end of the connecting rod 3 close to the crankshaft 2 is provided with an arcuate surface 31, which is in contact with the bottom of the mounting groove 21.

[0051] Reference Figure 2 and Figure 5A plunger pump crankcase also includes a plunger assembly 7. A first chamfer 23 is provided on the groove wall of the mounting groove 21 away from the bottom of the mounting groove 21. The first chamfer 23 is used for the arc surface 31 to abut. The number of plunger assemblies 7 is the same as the number of connecting rods 3 and corresponds one to one. The end of the connecting rod 3 away from the crankshaft 2 is hinged to the plunger assembly 7, and the hinge axis of the connecting rod 3 and the plunger assembly 7 is parallel to the rotation axis of the crankshaft 2. A working chamber 116 is provided on the cavity wall of the accommodating chamber 111 along the length direction of the box body 11. The working chamber 116 is connected to the outside world. The end of the plunger assembly 7 away from the connecting rod 3 is coaxially slidably embedded in the working chamber 116. The number of working chambers 116 is the same as the number of plunger assemblies 7 and corresponds one to one. The six working chambers 116 are divided into two groups. The two groups of working chambers 116 are symmetrically distributed along the length direction of the box body 11, and the working chambers 116 in the same group are symmetrically distributed along the width direction of the box body 11.

[0052] Reference Figure 5 and Figure 6 A plunger pump crankcase also includes a connecting ring 4 and a retaining ring 5. The connecting ring 4 is sleeved on the outer circumference of two connecting rods 3 in the same mounting groove 21. The connecting ring 4 includes a rigid connecting ring 41 and an elastic connecting ring 42. The connecting rod 3 is fixedly connected to the two side surfaces along the rotation axis of the connecting rod 3 with convex rings 32 respectively. The axis of the convex ring 32 coincides with the rotation axis of the connecting rod 3, and the inner wall of the convex ring 32 is flush with the arc surface 31. The number of rigid connecting rings 41 is the same as the number of convex rings 32 and corresponds one to one. The rigid connecting ring 41 is sleeved on the outer circumference of the convex ring 32. The inner wall of the rigid connecting ring 41 fits with the outer wall of the convex ring 32. One end of the rigid connecting ring 41 abuts against the side surface of the connecting rod 3 close to the rotation axis of the connecting rod 3. In this embodiment, the rigid connecting ring 41 is made of metal. A stepped groove 321 is coaxially formed on the groove wall of the protruding ring 32 on the side away from the other protruding ring 32. The number of elastic connecting rings 42 is the same as the number of stepped grooves 321, and they correspond one-to-one. The elastic connecting rings 42 are embedded in the stepped grooves 321, with the inner wall of the elastic connecting ring 42 conforming to the groove wall of the stepped groove 321. The thickness of the elastic connecting ring 42 is greater than the groove width of the stepped groove 321. One end of the elastic connecting ring 42 abuts the end of the rigid connecting ring 41 away from the connecting rod 3, and the other end of the elastic connecting ring 42 extends out of the stepped groove 321. In this embodiment, the elastic connecting rings 42 are made of rubber or elastic plastic. The number of the retaining rings 5 ​​is the same as the number of the elastic connecting rings 42, and they correspond one-to-one. The retaining rings 5 ​​are embedded in the mounting groove 21, with the inner ring of the retaining ring 5 abutting the bottom of the mounting groove 21. One side of the retaining ring abuts the side of the elastic connecting ring 42 away from the rigid connecting ring 41, and the other side of the retaining ring 5 abuts the groove wall of the mounting groove 21.

[0053] Reference Figure 6A ring groove 22 is provided on the outer periphery of the crankshaft 2. One mounting groove 21 corresponds to two ring grooves 22. The two ring grooves 22 are symmetrically distributed along the axial direction of the mounting groove 21. The ring groove 22 is used for the rigid connecting ring 41 and the elastic connecting ring 42 to be embedded. The inner walls of the rigid connecting ring 41 and the elastic connecting ring 42 abut against the bottom of the ring groove 22.

[0054] The implementation principle of a plunger pump crankcase in an embodiment of the present application is: during assembly, the assembled connecting rod 3 and plunger assembly 7 are correspondingly embedded in each working chamber 116, and then the crankshaft 2 is rotated and embedded in the accommodating chamber 111, and the two groups of rigid connecting rings 41 and elastic connecting rings 42 are respectively approached to the annular grooves 22 on both sides, so that the two groups of rigid connecting rings 41 and elastic connecting rings 42 are respectively embedded in the annular grooves 22 on both sides.

[0055] The connecting rod 3 is slid closer to the crankshaft 2, and the arc surface 31 abuts against the first chamfer 23, which guides the connecting rod 3 so that the connecting rod 3 is embedded in the mounting groove 21, and the arc surface 31 fits with the bottom of the mounting groove 21. The two connecting rods 3 corresponding to one mounting groove 21 are embedded in the mounting groove 21 at the same time, and the rigid connecting ring 41 on one side is slid out of the annular groove 22, so that the rigid connecting ring 41 is simultaneously sleeved on the outer periphery of the two convex rings 32 close to the side of the rigid connecting ring 41, and then the rigid connecting ring 41 on the other side is slid out of the annular groove 22 and sleeved on the outer periphery of the two convex rings 32 on the other side, and then the elastic connecting ring 42 is sequentially sleeved in the step groove 321 on the side of the connecting rod 3 to realize the installation of the crankshaft 2 and the connecting rod 3.

[0056] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A plunger pump crankcase, characterized in that: The invention comprises a housing (11), a cover plate (12), a crankshaft (2), a connecting rod (3), a rigid connecting ring (41) and an elastic connecting ring (42); the upper end of the housing (11) is provided with a receiving cavity (111); the cover plate (12) is connected to the housing (11) and covers the cavity opening of the receiving cavity (111); the crankshaft (2) is rotatably embedded in the receiving cavity (111); the rotation axis of the crankshaft (2) is horizontal; the crankshaft (2) is provided with a mounting groove (21); two connecting rods (3) are connected in any of the mounting grooves (21); the other end of the connecting rod (3) is hinged to the plunger assembly (7); the rigid connecting ring (41) and the elastic connecting ring (42) are sleeved on the outer periphery of the two connecting rods (3) in the same mounting groove (21); the outer periphery of the crankshaft (2) is provided with an annular groove (22); the annular groove (22) is used for embedding the rigid connecting ring (41) and the elastic connecting ring (42).

2. The plunger pump crankcase according to claim 1, characterized in that: There are a plurality of the mounting grooves (21); the plurality of the mounting grooves (21) are spaced apart along the rotation axis of the crankshaft (2); the axis of any of the mounting grooves (21) is parallel to and does not overlap with the rotation axis of the crankshaft (2); the distance between the axis of any of the mounting grooves (21) and the rotation axis of the crankshaft (2) is equal; and the axes of the plurality of the mounting grooves (21) are evenly distributed around the rotation axis of the crankshaft (2).

3. The plunger pump crankcase according to claim 2, characterized in that: An arcuate surface (31) is provided at one end of the connecting rod (3) close to the crankshaft (2); the end of the connecting rod (3) close to the arcuate surface (31) is rotatably embedded in the mounting groove (21); the arcuate surface (31) is in contact with the bottom of the mounting groove (21); and the rotation axis of the connecting rod (3) coincides with the axis of the mounting groove (21).

4. The plunger pump crankcase according to claim 3, characterized in that: The connecting rod (3) is connected to a convex ring (32) on one side along the rotation axis of the connecting rod (3); the axis of the convex ring (32) coincides with the rotation axis of the connecting rod (3); the rigid connecting ring (41) is sleeved on the outer circumference of the two convex rings (32); the inner wall of the rigid connecting ring (41) is in contact with the outer wall of the convex ring (32); the outer circumference of the convex ring (32) away from the other convex ring (32) is coaxially provided with a step groove (321); the elastic connecting ring (42) is embedded in the two step grooves (321); the inner wall of the elastic connecting ring (42) is in contact with the groove wall of the step groove (321).

5. The plunger pump crankcase according to claim 4, characterized in that: There are two convex rings (32); the two convex rings (32) are symmetrically distributed along the rotation axis of the connecting rod (3); the number of the rigid connecting rings (41) and the elastic connecting rings (42) is the same as the number of the convex rings (32) and corresponds one to one.

6. The plunger pump crankcase according to claim 5, characterized in that: The number of the annular grooves (22) is the same as the number of the elastic connecting rings (42) and corresponds one to one; the two annular grooves (22) are symmetrically distributed on both sides of the mounting groove (21) along the rotation axis of the crankshaft (2).

7. The plunger pump crankcase according to claim 5, characterized in that: The thickness of the elastic connecting ring (42) is greater than the width of the step groove (321).

8. The plunger pump crankcase according to claim 7, characterized in that: It also includes a retaining spring (5); the number of the retaining springs (5) is the same as the number of the elastic connecting rings (42) and corresponds one to one; the retaining spring (5) is embedded in the mounting groove (21); one side surface of the retaining spring (5) abuts against the groove wall of the mounting groove (21); the other side surface of the retaining spring (5) abuts against the side surface of the elastic connecting ring (42) away from the rigid connecting ring (41).

9. The plunger pump crankcase according to claim 3, characterized in that: First chamfers (23) are respectively provided on the groove walls on both sides of the installation groove (21); the first chamfers (23) are located on the side of the installation groove (21) away from the groove bottom of the installation groove (21); the first chamfers (23) are used for abutment of one end of the connecting rod (3) close to the arcuate surface (31).

10. The plunger pump crankcase according to claim 1, characterized in that: It also includes a lifting lug (13); a plurality of the lifting lugs (13) are provided; the lifting lug (13) is connected to a surface of a side of the cover plate (12) away from the box body (11); and the plurality of the lifting lugs (13) are spaced apart and distributed along the cover plate (12).

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