Straight shaft plunger pump

Abstract

The utility model relates to a straight shaft plunger pump which comprises a cover body and a cylinder body connected with the cover body, a driving shaft is rotatably arranged on the cover body and the cylinder body, the straight shaft plunger pump further comprises a bearing assembly, a plunger, a one-way valve and an elastic piece, the one-way valve is arranged in the cylinder body, one part of the elastic piece is connected with the one-way valve, and the other part of the elastic piece is connected with the driving shaft. The other part of the elastic piece is connected with the far end of the plunger, the near end of the plunger abuts against the bearing assembly, and the bearing assembly is inclined relative to the driving shaft and is rotatably arranged on the driving shaft. By arranging the bearing assembly, the bearing assembly is rotatably arranged on the inclined face of the driving shaft, the bearing assembly is integrally arranged on the driving shaft in an inclined mode, meanwhile, the third bearing is provided with a plurality of first roller mounting grooves in the axial direction, and first rollers are arranged in the first roller mounting grooves in the circumferential direction, so that rotation of the third bearing is achieved; the action point of hydraulic pressure borne by the third bearing during rotation is continuously changed, and the single-side stress condition of the third bearing is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic equipment, in particular to a straight-axis plunger pump. Background Art

[0002] The plunger pump is a hydraulic power element that uses the reciprocating motion of the plunger in the cylinder to cause the change of the sealed volume to achieve oil suction and oil pressure. It has the advantages of easy processing, high pressure, high efficiency, compact structure, etc. and is widely used in high-pressure, high-flow, and high-power hydraulic systems.

[0003] At present, the traditional plunger pump structure adopts the method of connecting the driving shaft and the swash plate through a key to achieve synchronous rotation. However, since the driving shaft and the swash plate are connected and rotate synchronously through a key, the swash plate will bear a large axial load on one side for a long time, thereby affecting the service life of the plunger pump. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present utility model is to provide a straight-axis plunger pump to solve one or more problems in the prior art.

[0005] To achieve the above purpose, the technical solution of the utility model is as follows:

[0006] A straight-axis piston pump comprises a cover body and a cylinder body connected to the cover body, a driving shaft is rotatably arranged on the cover body and the cylinder body, the straight-axis piston pump also comprises a bearing assembly, a plunger, a one-way valve and an elastic member, the one-way valve is arranged inside the cylinder body, a part of the elastic member is connected to the one-way valve, another part of the elastic member is connected to the distal end of the plunger, the proximal end of the plunger abuts the bearing assembly, the bearing assembly is inclined relative to the driving shaft and is rotatably arranged on the driving shaft.

[0007] Furthermore, a first mounting hole is formed inside the cylinder body, and a second mounting hole is formed inside the cover body, and a first bearing is installed in the first mounting hole and the second mounting hole respectively.

[0008] Furthermore, a second bearing is arranged inside the cover body near the first bearing.

[0009] Furthermore, the bearing assembly includes a third bearing, a fourth bearing and a gasket, and the fourth bearing is arranged between the third bearing and the gasket.

[0010] Furthermore, the third bearing includes a first frame body with a first hole, the inner side of the first frame body has a plurality of first roller mounting grooves, and a plurality of first rollers are axially arranged in the first roller mounting grooves.

[0011] Furthermore, the fourth bearing includes a second frame body with a second hole, and the second frame body has multiple groups of second roller mounting grooves radially arranged, and the second roller mounting grooves of each group are arranged from inside to outside along the circumferential direction, and a second roller is arranged in each of the second roller mounting grooves.

[0012] Furthermore, a third hole is opened in the center of the gasket.

[0013] Furthermore, the outer diameter of the gasket is the same as the outer diameter of the second frame body.

[0014] Furthermore, a steel ball is arranged inside the plunger.

[0015] Compared with the prior art, the beneficial technical effects of the utility model are as follows:

[0016] (I) The utility model sets a bearing assembly, and sets the bearing assembly rotatably on the inclined surface of the driving shaft, so that the bearing assembly is set on the driving shaft as a whole in an inclined manner. At the same time, the third bearing in the bearing assembly is provided with a plurality of first roller mounting grooves along the axial direction, and the first rollers are arranged along the circumference and set in the first roller mounting grooves to realize the rotation of the third bearing, so that the point of action of the liquid pressure on the third bearing changes continuously during the rotation, thereby improving the unilateral force condition of the third bearing and increasing the service life of the third bearing.

[0017] (ii) Furthermore, the fourth bearing has multiple rows of second rollers, wherein one row of second rollers is close to the inner ring of the second frame body, and another row of second rollers is close to the outer ring of the second frame body, so that each row of second rollers can rotate independently, thereby reducing the linear speed difference between the second rollers in the inner ring and the second rollers in the outer ring, avoiding the second rollers from slipping, further avoiding excessive temperature rise of the fourth bearing, and thereby increasing the life of the fourth bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The schematic diagram of the structure of the straight-axis plunger pump according to the embodiment of the utility model is shown.

[0019] Figure 2 The schematic diagram of the structure of the bearing assembly in the straight-axis plunger pump according to the embodiment of the utility model is shown.

[0020] Figure 3 The schematic diagram of the structure of the third bearing in the straight-shaft plunger pump according to the embodiment of the utility model is shown.

[0021] Figure 4 The schematic diagram of the structure of the fourth bearing in the straight-axis plunger pump according to the embodiment of the utility model is shown.

[0022] Figure 5 The schematic diagram of the structure of the gasket in the straight-axis plunger pump according to the embodiment of the utility model is shown.

[0023] Figure 6 A partial structural schematic diagram of a straight-axis plunger pump according to an embodiment of the utility model is shown.

[0024] Markings in the accompanying drawings: 1, driving shaft; 100, inclined plane; 2, bearing assembly; 3, plunger; 4, steel ball; 5, cylinder body; 501, first mounting hole; 502, plunger hole; 6, elastic member; 7, one-way valve; 8, first bearing; 9, second bearing; 10, cover body; 1001, second mounting hole; 11, oil seal; 12, third bearing; 1200, first frame body; 1201, first roller mounting groove; 1202, first roller; 1203, first hole; 13, fourth bearing; 1300, second frame body; 1301, second roller; 1302, second roller mounting groove; 1303, second hole; 14, gasket; 1400, third hole. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the utility model clearer, the straight-axis plunger pump proposed in the utility model is further described in detail below in combination with the accompanying drawings and specific implementation methods. According to the following description, the advantages and features of the utility model will be clearer. It should be noted that the accompanying drawings adopt a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the implementation method of the utility model. In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structure, proportion, size, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so it has no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the effect that the utility model can produce and the purpose that can be achieved, should still fall within the scope of the technical content disclosed by the utility model.

[0026] Hereinafter, the term "proximal end" generally refers to the end of the drive shaft that outputs power, and the term "distal end" generally refers to the end of the drive shaft that is away from the power. Figure 1 For example, Figure 1 The left side of the driving shaft is the proximal end. Figure 1 The right side of the driving shaft is the far end.

[0027] Please refer to Figure 1The straight-axis piston pump comprises a cover body 10 and a cylinder body 5 sealed with the cover body 10, and the driving shaft 1 is rotatably arranged on the cover body 10 and the cylinder body 5. Specifically, a first mounting hole 501 is opened inside the proximal end of the cylinder body 5, and a first bearing 8 is arranged in the first mounting hole 501. Similarly, a second mounting hole 1001 is opened at the proximal end of the cover body 10, and another first bearing 8 is arranged in the second mounting hole 1001. The first bearing 8 is preferably a sliding bearing. Similarly, in order to support the driving shaft 1, a first bearing 8 is provided near the second mounting hole 1001 (please refer to Figure 6 ), a second bearing 9 is further arranged inside the cover body 10, the inner ring of the second bearing 9 is pressed onto the outer side of the driving shaft 1, and the outer ring of the second bearing 9 is pressed onto the cover body 10, the second bearing 9 is preferably a tapered roller bearing, and the outer ring of the tapered roller bearing is pressed onto

[0028] For further information, please continue to refer to Figure 1 The straight-axis piston pump further comprises a bearing assembly 2, a piston 3, a one-way valve 7 and an elastic member 6, wherein a piston hole 502 is further provided in the cylinder body 5, the one-way valve 7 is arranged inside the cylinder body 5, the distal end of the elastic member 6 is connected to the one-way valve 7, the proximal end of the elastic member 6 is located in the piston hole 502 and connected to the distal end of the piston 3, the proximal end of the piston 3 abuts against the bearing assembly 2, the bearing assembly 2 is tilted relative to the driving shaft 1 and is rotatably arranged on the driving shaft 1. A steel ball 4 is also arranged inside the piston 3.

[0029] For details, please continue to refer to Figure 1 In order to ensure sealing, an oil seal 11 is further installed on the cover body 10 at the proximal end of the driving shaft 1 .

[0030] For further information, please refer to Figure 2 The bearing assembly 2 includes a third bearing 12 , a fourth bearing 13 and a gasket 14 , and the fourth bearing 13 is disposed between the third bearing 12 and the gasket 14 .

[0031] For details, please refer to Figure 2 and Figure 3 The third bearing 12 is a swash plate bearing, and the third bearing 12 includes a first frame body 1200 with a first hole 1203. The inner side of the first frame body 1200 has a plurality of first roller mounting grooves 1201, each of which is arranged in a circumferential direction, and a plurality of first rollers 1202 are axially embedded in the first roller mounting grooves 1201. The third bearing 12 can be rotated relative to the driving shaft 1 through each of the first rollers 1202.

[0032] For further information, please refer to Figure 4The fourth bearing 13 is preferably a plane thrust roller bearing, and the fourth bearing 13 includes a second frame body 1300 with a second hole 1303, and the second frame body 1300 has multiple groups of second roller mounting grooves 1302 radially opened, and the number of second roller mounting grooves 1302 in each group is 2. The second roller mounting grooves 1302 in each group are arranged from the inside to the outside along the circumferential direction, and a second roller 1301 is arranged in each second roller mounting groove 1302.

[0033] For further information, please refer to Figure 5 The gasket 14 is a circular gasket, a third hole 1400 is opened at the center of the gasket 14 , and the outer diameter of the gasket 14 is the same as the outer diameter of the fourth bearing 13 .

[0034] The specific working process of the utility model is as follows:

[0035] Please refer to Figure 1 The whole of the bearing assembly 2, namely the gasket 14, the fourth bearing 13 and the third bearing 12, is installed on the inclined surface 100 of the driving shaft 1, so that it forms an inclination angle with the axial center of the driving shaft 1. Due to the existence of the inclination angle, when the driving shaft 1 rotates, the plunger 3 can reciprocate forward and backward along the axial direction in the cylinder body 5. When the volume of the enclosed space between the plunger 3 and the cylinder body 5 becomes smaller, the one-way valve 7 is opened by the elastic force of the elastic member 6 and the hydraulic pressure, and the steel ball 4 is close to the conical surface inside the plunger 3. The hydraulic pressure acts on the third bearing 12 through the plunger 3 to complete the oil pressing action. On the contrary, when the volume of the enclosed space formed by the plunger 3 and the cylinder body 5 increases, the steel ball 4 loses the effect of the hydraulic pressure and is no longer tightly attached to the conical surface inside the plunger 3, and it regains its freedom, realizing the closure of the one-way valve 7 to achieve the oil suction action. At this time, the plunger 3 is only subjected to the force of the elastic member 6. Due to the relative rotation between the third bearing 12 and the driving shaft 1, the point of action of the hydraulic pressure on the third bearing 12 is constantly changing, thereby improving the long-term unilateral force condition of the third bearing 12.

[0036] Furthermore, when the third bearing 12 and the active shaft 1 rotate relative to each other, since the fourth bearing 13 has two rows of second rollers 1301, the fourth bearing 13 can also rotate relative to the active shaft 1. Since one row of second rollers 1301 is close to the inner ring of the second frame body 1300, and the other row of second rollers 1301 is close to the outer ring of the second frame body 1300, the inner ring second rollers 1301 and the outer ring second rollers 1301 can rotate independently, thereby reducing the linear speed difference between the inner ring second rollers 1301 and the outer ring second rollers 1301, thereby avoiding the second rollers 1301 from slipping, thereby further avoiding the fourth bearing from heating up too quickly.

[0037] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0038] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A straight-axis plunger pump, comprising a cover body and a cylinder body connected to the cover body, wherein a driving shaft is rotatably arranged on the cover body and the cylinder body, and characterized in that: The straight-axis plunger pump also includes a bearing assembly, a plunger, a one-way valve and an elastic member. The one-way valve is arranged inside the cylinder body, a part of the elastic member is connected to the one-way valve, and another part of the elastic member is connected to the distal end of the plunger. The proximal end of the plunger abuts the bearing assembly, and the bearing assembly is inclined relative to the driving shaft and is rotatably arranged on the driving shaft.

2. The straight-axis piston pump according to claim 1, characterized in that: A first mounting hole is formed inside the cylinder body, and a second mounting hole is formed inside the cover body. First bearings are respectively installed in the first mounting hole and the second mounting hole.

3. The straight-axis piston pump according to claim 2, characterized in that: A second bearing is also arranged inside the cover body near the first bearing.

4. The straight-axis piston pump according to claim 1, characterized in that: The bearing assembly includes a third bearing, a fourth bearing and a gasket, and the fourth bearing is arranged between the third bearing and the gasket.

5. The straight-axis piston pump according to claim 4, characterized in that: The third bearing comprises a first frame body with a first hole, the inner side of the first frame body is provided with a plurality of first roller mounting grooves, and a plurality of first rollers are axially arranged in the first roller mounting grooves.

6. The straight-axis piston pump according to claim 4, characterized in that: The fourth bearing includes a second frame body with a second hole, and the second frame body has multiple groups of second roller mounting grooves radially arranged, and the second roller mounting grooves of each group are arranged from inside to outside along the circumferential direction, and a second roller is arranged in each of the second roller mounting grooves.

7. The straight-axis piston pump according to claim 6, characterized in that: A third hole is also provided at the center of the gasket.

8. The straight-axis piston pump according to claim 7, characterized in that: The outer diameter of the gasket is the same as the outer diameter of the second frame body.

9. The straight-axis piston pump according to claim 1, characterized in that: A steel ball is arranged inside the plunger.

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